Looks like you've succeeded in fastening the three sections together about as well as it can be done. I didn't know it could be done that neatly.
Am I to gather that you've decided to sand off the molded "wood grain" (which, as I recall, consists of raised lines - not countersunk grooves) and scribe the edges of the planks to scale? I feel obliged to point out that that will probably take longer than installing genuine wood planks. But to each his own. One advantage I can see in your method - and it's a significant advantage - is that it will let you take advantage of the joggled margin planks, which, as I recall (beware my Halfzheimer's-afflicted memory), Revell indicated quite nicely. (Much better than Heller did with its Victory.)
These photos do, however, remiind me of a flaw in the Revell kit that I'd forgotten about.. It looks like the deck, when the warp is taken out of it, is perfectly flat. As anybody who's ever made a drawing of a ship with old-fashioned rapidograph and ink can tell you, there are virtually no flat surfaces, straight lines, or right angles in the basic shape of an eighteenth-century ship's hull. (The keel is straight. That's about it.) Ships' decks (with rare exceptions - e.g. aircraft carriers) aren't flat. They're cambered - that is, arched up in the middle. The reason was simply to encourage water to flow into the scuppers - and maybe, in a warship, to make it easier to run out the guns. The curvature was usually about 1/4" for every foot of the ship's beam. (It's actually a bit more complicated; if anybody's really interested, there's a table in Peter Goodwin's The Construction and Fitting of the Sailing Man of War.) If you think about it a minute, you'll see that the ratio doesn't change when the lines are reduced to model size. If I remember right, the Constitution's beam on 1/96 scale is about 6". So the deck should be about 1/8" higher at the centerline than at the waterway.
The camber was cut into every deck beam - on the top and bottom of it. I greatly admire those old shipwrights who did the job - with nothing but a compass (probably consisting of a pencil, a long piece of string, and a peg in the ground) , an adz, and a two-man hand saw. A little trigonometry establishes that the radius of the curve needs to be about 6 times the length of the beam. What a job - and they had to repeat it dozens of times in each ship.
The camber in a sailing ship's decks is so subtle that its almost undetectable on a model - unless it's not there. There are two places where the absence of camber is obvious: the ends of decks (or big hatches, like the one between the Constitution's forecastle and quarterdeck) and the tops of hatch coamings (which should have, if anything, slightly more "crown" than the rest of the deck. Thwartships deck furniture, like fiferails, also has camber.
This is one area where Heller beat Revell. The Heller Victory has separate plastic deck beams with camber molded into them. Clamp the deck components to the beams while the glue dries, and the camber will be right. Another plus for Heller: the decks are split on the centerline, where the joint can be camouflaged as a seam between planks. (Earlier Heller sailing ship kits had flat decks. It would be nice to think that a couple of model magazine reviews had something to do with the revelation. I do know that one of my reviews of the Victory got quoted by Heller in an ad for the kit. So somebody must have read it.)
Whether any of this is important is, of course, up to the individual modeler. When I look at a model one of the first things I notice is the deck camber, but, as should be obvious by now, I'm weird. It's not for me to tell Force 9 how to build his models. But it would seem a little jarring if a beautifully super-detailed model like this were to have flat decks.
And please don't ask me how to fix the problem. I have no idea what it would take to force the plastic deck components into the necessary curvature. One of my pet peeves about those infernal HECEPOB (that's Hideously Expensive Continental European Plank-On-Bulkhead) kits is that their designers insist on making decks out of plywood. The surface of a deck (unless you're building an aircraft carrier, or a modern ship with "knuckle camber") is a compound curve, and plywood doesn't like being forced into a compound curve any more than you or I would. That's why our ancestors figured out, at least 500 years ago, that the easiest way to build a ship'sdeck is to make it out of narrow planks. The same goes for ship models.
End of sermon. Sorry.