It's a hell of a lot harder than you'd think it'd be.
I'd personally go with a more simple shape to start out, such as a Flying V of some sort.
Fretting the neck is a giant pain for me.
Applying a finish is the easy part.
I don't know, I'm more of a pedal-builder myself. I always feel like if I tried to build a guitar, I'd screw it up somehow and I'd have wasted the money on making it.
By the way, this is the wrong forum for this.