My router bit is 12.7mm, after reading one of GSP' post I bought a 20mm and 15mm bearing, so I could trim the body down in stages.
I used the shaped waste parts of the body and template to act as a support for the router, which is particularly useful when doing the horns. The mdf was stuck to the Ash with double sided tape, and after I had routed 3/4 of the sides I flipped everything over then used a bottom bearing guided bit to finish off.
Some relief holes drilled out before hollowing out the 2 sections, and I have also drawn in and written on the body where to route for the pup wires, as I forgot to do this on my previous build and had to drill the holes through the pickup cavity using a 20" bit because of the angle.