Yeah was thinking about that too.Reradiusing precuts are a pain. The width will likely be insufficient for an 8 string too.
If you want jumbos (I suppose 6100 or the equivalent?) an established luthier will most likely have a stash
Frets would be SS Dunlop 6100 or the equivalent Jescar.
It's probably just me being anal about what he means by "jumbo" frets.
I'll probably just ask if he has some jumbo fretwires and see what he says.