I haven't built many single-cut guitars, but for the last one I made a jig, and matching template for the neck mortise. It worked really well, and this will be the first occasion to use it since then. Both the jig, and the body template have the angle built in. I didn't look at anyone Else's design, but instead envisioned on doing it this way before I had the chance. I dig making my own jigs. I have many that are made from the simplest of materials like this one, but are very accurate. I'll need it for both of these guitars.
I put a lot of thought into the cutaway on this guitar. It is after all for me. I looked at several examples. I found that many of my favorites shared a similarity. The cutaway, and the return to the body had a symmetry to them. Like the letter S, but not exaggerated. I used this concept, and oriented the 'S' vertically. I sketched it a few times until I found a balance that liked. I like doing full scale layouts. On this one, it really helped. I already had the templates, so it was easy. This is with a 22 fret neck joining at the 16th fret. (like a les paul) I plan to use a vintage Nashville T-O-M that I have with a traditional tailpiece. I drew in the area that will be chambered. I'll trim it with single ply black binding. I'm working on an idea for some custom humbucker surrounds coordinated with a floating pick guard reminiscent of a late 50's National. I'm not committed to anything, but I like a subtle art deco vibe.