[Neil K Walk]

There are alternatives if you're strapped for resources or funds to acquire a premade dish. I've seen methods where a sanding board with a curved sanding surface is used, much in the same manner as the sanding disk. A second sanding board is used for the upper bout where the fretboard extension is to be because that area needs to be dead flat to simplify arriving at the proper neck angle, else there will be a "hump" in the fretboard above the 14th fret. As for use as a guide to gluing drowned radiused braces, there's also the stacked (or is it fanned?) deck of index card trick to approximate the radius.

I've borrowed a friend's radius dishes but I may try the methods I outlined above just to see.