I've never done any research on this particular ship, but maybe I can help a little.
The pictures Grahor found on the web are a bit of a mixed bag. The painting by Mark Meyers is excellent and helpful. He's a modern artist who knows how to do research; I think you can rely on him thoroughly. The second painting has the virtue of being (apparently) contemporary with the ship, but doesn't have a great deal to offer in the way of information.
The first of the two model photos shows an excellent model in the Merseyside Museum. Apart from the obvious difficulty that the photo doesn't show the complete model, it should be extremely useful. (It makes much of the color scheme pretty clear, for instance.) I have to agree that the second model photo isn't of much value for this particular project.
It's safe to assume, given the date of the ship, that the deckhouses were paneled with wood. The Merseyside model gives at least some indication of what they ought to look like. There may have been skylights in one or more of the deckhouse roofs (the kit parts should make that clear), but if the parts don't have any indications of glass panes in them it's safe to assume they represent wood planking - probably, unless you have some reason to think otherwise, in the same color as the deck planking.
Rigging diagrams in plastic sailing ship kits almost invariably are simplified considerably - especially in the smaller kits, like this one. When I'm done typing this I'll do a little digging and see if there are any convenient sources for plans of this ship. The paintings and the Merseyside Museum model suggest that her rigging was pretty typical for a sailing ship (or sail/steam ship) of the period. If you can't find a decent rigging diagram, careful study of that model photo should help a good deal. (You might try e-mailing the Merseyside Museum. It's quite possible that they have some more photos available, and could send you prints for a reasonable price.)
Those plastic-coated thread "shrouds and ratlines" used to be standard in Airfix and Revell kits. Modelers have differing reactions to them. I have to agree that they look somewhat better than the injection-molded attrocities Revell usually provides nowadays (in the few sailing ships it still sells), but the plastic-coated thread has its drawbacks. It's slippery (meaning it's almost impossible to tie in a good knot), and extremely difficult to set up tightly. (The shrouds in a sailing ship are set up just as tight as possible; they have to be in order to do their job. Drooping shrouds just aren't found in operating sailing ships.) And finally, the manufacturers don't acknowledge that the shrouds are supposed to be much heavier than the ratlines. I personally don't care much for these things, but some modelers seem to like them.
My personal opinion, which I've voiced more than once here in the Forum, is that most modelers over-estimate the difficulty of rigging shrouds and ratlines to scale. If you do a Forum search on the word "ratlines," you'll find quite a few discussions of the subject. For this particular model I think I'd recommend trying the "needle through the shroud" method. Personally, I'd rather just rig the shrouds on a model like this, and omit the ratlines altogether, then wrestle with the plastic-coated thread things. But I guess that's a matter of personal taste.
Hope that helps a little. Good luck.