Generally speaking:
If you intend to explore fiber glassing, suggest you start with a small (plane) and see how you do. Many methods can be looked at.
It is also better to start off with the use a foam wing that was hot wired and cover it. (Guess why)
Be prepared to do a lot of sanding to reduce the weight of the epoxy and glass to make it look nice for painting. Otherwise, excess paint fills the pits and increases the weight.
Bet your 2 halves of the wing(left and right) will not balanced in weight(glass and epoxy), expect some funky flying until you do dynamic balancing.
3D planes are best if built light, fiberglass is mainly used when high "g's" are encountered. Pylon racer's(5 lb plane at 200mph) encounter from 50 to 80 g's in turns. If you build a 5 lb 2 oz plane, it is used for practice laps. So your goal was to be less that 5 and add a pinch of weight and yet survive the turns. Planes are checked to see if they meet requirements, otherwise people tend to cheat. Unless your good at glassing, get it done by the expert.