Quite a bit seems to have been added to this thread in a hurry! I can't contribute much, but I do have a few minor comments.
Quite a few modern scholars seem to agree that the word "carrack" may well have fit the Santa Maria. But so little is known about her, and the precise definition of the term is so sketchy, that I wouldn't want to argue the point. Columbus himself, writing in Spanish, referred simply to the "nao" Santa Maria and the "two caravels" Nina and Pinta. The literal translation of "nao" is simply "ship." So far as I know, there would be no reason for a Spanish-speaker not to use it in referring to a carrack. The one thing that's fairly clear is that she wasn't a caravel.
Regarding the royal - I've read several explanations of the term and chronologies of its appearance, but I have my doubts about all of them. The contemporary pictures of the Sovereign of the Seas/Royal Sovereign do indeed seem to be the first authentic ones to show royals. James Lees's Masting and Rigging of English Ships of War (which, in general, I tend to regard as the bible on the subject) asserts that no other ship carried royals prior to 1790. I'm convinced that's a mistake. When I was digging up info about the Continental frigate Hancock I found quite a few contemporary paintings showing ships of the American Revolution with royals. The contemporary inventories of the Continental frigates Raleigh and Alliance include royals (or "topgallant royals") on all three masts.
The term "topgallant royal," in its strictest sense, apparently refers to a sail that, with its yard, was "set flying" on the extremity of the topgallant mast. The yard apparently was secured to the mast temporarily; when the sail was to be furled the yard was lowered by means of its halyard and the whole assembly was stowed inside the topmast shrouds. I think the royal (with the exception of the ones on the RS) made its initial appearance in that form sometime around the 1760s or thereabouts. By the time of the American Revolution the terms "royal" and "topgallant royal" apparently were being used almost interchangably. The genuine, honest-to-goodness, permanently-rigged royal yard certainly was in use by 1810 or thereabouts - though some ships seem to have set their topgallant royals flying through the Napoleonic Wars.
Regarding the Santa Maria's sails - as I understand it, the most clear, firm piece of information we have about that ship is an entry in Columbus's logbook in which he says (this is an approximate quote) "I allowed them to set all the sails." (Note the verbiage.) He then lists them (I think I have this right): spritsail, foresail, mainsail with bonnet, main topsail, mizzen, and the boat's sail on the poop. (There may have been two bonnets on the mainsail, and one on the fore; I don't remember. I'm sure the Anatomy book will clear that up.) But there certainly was no topgallant on the list. To my knowledge the first reliable illustrations showing topgallants come from sometime in the middle of the sixteenth century.
It's worth remembering that during this period ships' sail plans were remarkably sharply tapered. Each yard was almost exactly half the length of the one below it. A sail set on a yard half the length of the Santa Maria's main topsail yard would be so small as to be virtually useless.
The bonnet was a relatively narrow strip of canvas attached temporarily to the bottom of the course as a means of expanding it in light winds. It was attached to the course by a simple series of rope loops, which were passed through grommets in the foot of the course. Samuel Eliot Morison (speaking of bibles) says the grommets were labeled, from one side of the course to the other, "A-M-G-P-A-M-G-P" etc. When the ship's boy laced or unlaced the grommet he was supposed to recite "Ave Maria Gratia Pleni, Ave Maria Gratia Pleni," etc.
I agree that 1492 is a bit early for outboard channels and chainplates - though that sort of thing is difficult, if not impossible, to pin down. I have in front of me a nice color reproduction of a contemporary painting showing the departure of Henry VIII from Dover in 1520. It contains lots of fascinating details - including remarkably clear chainplates (and heart-shaped deadeyes, aligned in straight rows). Apparently the outboard channel and chainplate appeared during the first ten or fifteen years of the sixteenth century.
The skysail was indeed a common feature of mid-nineteenth-century clippers ships, but made occasional appearances earlier. It's been established quite firmly that the U.S.S. Constitution carried skysails on all three masts during at least part of the War of 1812. The skysail seems never to have been regarded as a major component of the ship's propulsion system; it's been suggested more than once that it didn't contribute much beyond appearance. By last quarter of the nineteenth century it had virtually disappeared. (The Cutty Sark had a main skysail earlier in her career, but none on the fore or mizzen.) Some of the big American clippers of the mid-nineteenth century stacked square sails even higher. The one I'm (sort of) working on, the Young America, had a moonsail (or moonraker) above the skysail on her mainmast early in her career. (She only made a couple of voyages with it. By 1856 the moonsail had disappeared from her sailplan - and she'd been rerigged with double topsails.) I'm pretty sure the Pamir did not have skysails. By her day the sail plan of the big working sailing vessel had settled down to six sails on each mast: course (or crojack), lower topsail, upper topsail, lower topgallant, upper topgallant, royal.
Spelunko - I don't believe in No-No's, but there's fairly universal agreement among ship modelers that balsa is just about the worst wood there is for ship modeling.
I don't have any reason to believe that balsa wood is any less durable than other woods. But the notion that it's is easier to work than harder woods is pure fiction - fiction written by people who've never tried to work with any other kind of wood. The truth is that, because it's so soft, balsa is a difficult wood to work with any precision. It caves in under the pressure of any but the sharpest blade, splits easily, picks up dents from the smallest accidental bump, and soaks up finishing materials like a sponge. Balsa has two virtues. 1. It's light in weight. (That matters a great deal to builders of flying model airplanes, but is irrelevant to ship modelers.) 2. It's easy to get. (That's because so much of the hobby business used to be centered on flying model airplanes.) I have no idea what the situation is in Taiwan, but decent hobby shops in the U.S. nowadays stock the much superior basswood, which is available in almost as many sizes - and costs just about the same. I've heard people expound at great length on the things that can be done with balsa. But I can't recall ever having met a single modeler who, having been shown the difference between it and basswood (or pine, or birch, or beech, or any other decent wood) went back to balsa.
You can make a perfectly respectable miniature barrel from a piece of wood dowel. (Again, I don't know how things are in Taiwan. In the U.S., the dowels sold in hardware and craft stores are generally birch, which is a nice wood for modeling.) It's especially easy if you have an electric drill - but a hand drill will work if you get somebody else to turn the crank. Clamp the drill down to your work surface somehow, chuck a length of the dowel into the drill, turn on the switch, and go to work with a file (or even a folded-up piece of sandpaper). It will take a little practice, but my guess is that if you start teaching yourself to make barrels at 6:00 in the evening, by 8:00 you'll be turning out beautiful ones at the rate of one every three minutes.
Too long as usual. Good luck.