RE: Epoxy or CA for framing?
rfw, "build light to fly, build strong to crash" Since you're on your first kit I'll invoke the classic advice. No matter how big the kit is, you can easily turn a nice flying and forgiving design into a nasty pig by letting the weight get out of hand. Trust the kit designer, he put in enough strength while keeping the weight in check. Think bird wings, not bulldozer frames.
I wouldn't have started with a 1/4 Cub (and didn't), you could have learned (made your mistakes) on something smaller and simpler.
Try the various glues on some side projects or scraps, you'll find uses for lots of them.
I'd like to caution you about thin CA, it flies around easily and emits nasty fumes is you dump it on. Eye protection is a very good idea!
As mentioned above, CA-soaked balsa is impossible to sand so it's helpful to use Titebond on external surfaces.
I use Titebond anywhere I'd use epoxy.