Update time:
The company I bought the neck and body from exchanged the 21 fret flame maple neck for a roasted flamed maple neck with 22 fret rosewood fingerboard.
I don't yet own a guitar with a rosewood board so figured this might be a new experiment with the mahogany body. Tonally I don't expect too much of a difference to normal maple, perhaps the rosewood will mean slightly less obtrusive fret noise. Still haven't decided on finish for the HSH body but saw an interesting video on decorating a guitar with gold leaf...could get messy though. I also pulled the trigger on a second Kahler trem, this time an older 4300 X trem (US made version, not Chinese) in chrome. It has a locking function a bit like the Wilkinson.
No screws or routing template so they're currently on order from Whammyparts.com and will be sent over with the bridge. This gives me an option of going with either a Wilkinson or Kahler depending on how much whammying I might feel like doing and how much faff there might be in getting the wilkinson to fit the routing provided. The sanding discs, MDF sheet and body filler have arrived so need to collect and maybe start work this afternoon on sanding and the neck pocket template. Speaking of the neck pocket, I've also found some 2mm thick sapele veneer which might work as a shim if glued in place. It's slightly harder than mahogany which is ideal and looks nearly the same. The tricky part will be trying to clamp it securely in place after gluing as the pocket is fairly confined.
I also still have a laminated mahogany and maple neck left too. Although originally intended for an MSG shaped build with set in neck joint, it could be adapted for a bolt on build as well.