I'm still dreaming about trying to make one of these happen. I'd have to approach this as a fun build project and I'd LOWER my expectations. But thinking I might buy a GS mini or something and then copy the measurements on a new build, and add on the bass arm. Thinking also it would be cool to do this in a fanned fret and then just have a continuous angle saddle across a straight bridge covering the whole shebang.
The better builders here are probably shaking their heads...
Well, if its a disaster, it'll be MY disaster!