Be careful when staining. In order to get a good uniform stain job you need to stain the parts before assembly. The problem here is that most stains have waxes in them and the glue will not stick. One more word of caution- even though the parts may stick together well at first, as time (months) pass the glue joints will begin to fail.
Proctor sells some lacquer base stains that do not waxes. I've tried to find them locally without any luck. Gary at Proctor says they have them special made.? This would be the best options for "pre-staining". I have had good luck using water based stains in a pinch, but would still recommend Proctor.
Your second option would be to build first then stain, but... Usually formers, ribs, and stringers are of different types of wood and require different stains- staining after assembly is hard. Plus the stains don't usually stick to the glue joint areas.
And I second MinnFlyer- worldtex or solartex will work fine.