Thanks for the info fellas.
Muskyman, A tip on cutting string grooves the same, that I believe I got from this site, is to use two files. Barely start a good groove then put it on bottom. Place a file in it and use it as a guide for cutting the other one. I do a little at a time so I have correction time.
Pappy, I usually do a 45 as well but seem to need to open the bottom a bit for a smoother transition as you mention. I have some overlay material just haven't done one yet, with the exception of a kid bow that the tips got too skinny to cut a string groove. They are about the same as Eric described and work good. I do like the way overlays look though.
Piddler