My brother is a muscian--plays guitar--If I were you from what I have learned from my brother, I would first have the guitar looked at by a person knowledgeable with Fenders---some early and late '70's are worth quite a bit--depends upon the model and condition--if it is a Stratocaster could be worth some $$--my brother bought a reconditioned early '70's Stratocaster a few years ago for around $1200 from a shop in LA, had been rebuilt to specs and finish. It is his prize axe
Just something to think about---sell it in it's orginal condition if it is worth it--then use the funds to support the youth group-- or if not just finish the body anyway you want--like finishing a glass body -- just a FWIW
Several years ago I refinished Ron's 12 string Martin, electric pick-up, after he badgered me for awhile-- he dismantled the guitar,strings, electrics, and frets, and I then refinished the body and neck. I used a clear lacquer finish, about 10 coats. Still plays the thing, usually with his church group