Late to the party!
How lucky am I to be able to not only workshop amp design with sookwinder, but also to benchmark the design with his OG amps and improved builds?
The JM is a parts build - Allparts neck bought from OSGer Cross Guitars, body from Guitar Mill, paint is Duplicolor rattle can "Inca Silver". Duplicolor rattle can clear on top. Came out with a lot of blue in the silver, so definitely in the ^ Firemist Silver/Ice Blue Metalic/Pelham Blue zone. Really happy with the colour. Mastery trem and bridge. Another feature of this JM is how light it is - the body is ultralight swamp ash, and raw it was 2 lb 10 oz! Haven't weighed it, but I guess the finished guitar is ~ 6.5 -7 lb.
HorseyBoy - yes indeed, pickups are the prototype JM Wide Range Mini Humbuckers

Hope you're digging yours!