yes it would! Go for it my friend! Would love to see a guitar body with an authentic web on it, sooooo much nicer than a drawing or painting. Please be nice to spiders, and be safe, they bite:) I like to relocate them before i use any paint as they are sensitive to fumes. A jar works good, but you'll want a stick to get them off the web.
I'd have to go back to Louisiana during the summer. All the big ones come out then.