We took this up in some detail in Grymm's other thread - the one titled "Soleil Royal prep work." It's now (evening of March 11) on p. 2 of the topic list.
Parrels on 1/100 scale aren't difficult to make. Millard's suggestion is a good one. The wire holding the mast to the yard will be invisible when the model's finished, and will add considerable strength to the assembly. The rigging of a ship model doesn't behave exactly as the prototype does when the model gets a little age on it. Lines tend to age inconsistently; a yard that was perfectly level when you built the model may acquire a slight but irritating tilt five years later. That wire-and-superglue arrangement will resist that tendency.
I'll take the liberty of offering three small suggestions. One - there's no need to worry about the details of such things as yard parrels now, when you're just starting the model. You won't need parrels for several months.
Two - don't try to rig the parrels or any other parts of the rigging till you've got at least one good book on the subject in front of you. (In this case, Anderson's Rigging of Ships in the Days of the Spritsail Topmast is the one to get.) That website, which reproduces parts of Mondfelt's Historical Ship Models, is excellent for what it is: an introduction to the subject. But the rigging of a seventeenth-century ship-of-the-line is a big project, and a good book makes it much, much easier. The book will, for instance, discuss the sequence in which the various lines and other rigging components need to be set up. (That may seem obvious, but it frequently isn't.)
Three - as you study the books and websites, give some careful thought to just what you're trying to do with this particular model. As we discussed a while back, the kit suffers from some serious errors in terms of accuracy. To put every piece of rigging on it that's described in the Anderson book will take many, many months - and probably cost well over a hundred dollars in aftermarket parts. Does it make sense to put that kind of effort, time, and money into a model with a distorted hull and no deck camber? I don't pretend to have a "definitive" answer to that question - except to reiterate that, in my opinion, it depends on the individual modeler. I put just about every piece of rigging I could justify on the Soleil Royal that I built back in the seventies. If I'd had the sense to do a little preliminary reading, and found out how inaccurate the kit was, I don't think I would have done that. (I certainly would have put parrels on the yards, though.) The amount of effort a given project justifies should, in my opinion, be entirely up to the builder. But I do think the builder has a right to go into the project with eyes wide open.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.