As with anything else that you may try to replicate from Star Wars, the best sources for visual information are the movies themselves. So, my advice to you is to watch the trilogy with your remote control and a sketchbook. [Additional note: Please do not ask me how to make a flight suit. For one thing, I can't sew. Secondly, my Jedi-Like Seamstress Mother will tell you to do the same thing I just told you, and not much more.]
In this case, and I gaurantee it will be the same for any other particular X-wing, the original Battle of Yavin was more than enough information. In fact, if you watch the rest of the movie with a sharp eye for X-wing detailing, as I did, you find an astonishing number of blatent mistakes. Add to that the confusion that the Special Edition generates (They _really_ screwed up on the markings). So, for ship-marking deatils, look at the original model shots, and do your best to ignore the generic X-wing hanger set pieces.
The areas of interest on an X-wing are:
So, watch the Trilogy, and take notes. If you can find a bunch of stills, that's good too. It's very likely that you will then be forced to decide which variations in the design you want to be loyal to, if any. I decided to stick to the classic Red 5 motion control models, because of all the variations, those look the best. Plus, I really do idolize the early ILM model artists. Hats are always off to those guys.
And try not to bash the SE CG scenes, the merchandising or the "replicas" too much for being completely, totally, and in some cases inexcusably inaccurate. Most of them are...
I'd like to think I'd make a decent continuity consultant.