Excuse the crap picture, but I finally finished my KGSSHV after way too much procrastination. It is running just fine and I managed to avoid any and all magic smoke to the surprise of myself. The wiring and general layout is still a little rough but I'll fix it up some other time. Big thanks to Kevin for the great design and to Birgir for boards/transfomer/some other parts as well as being very helpful along the way. Also a huge thanks to @gepardcv who helped me out with a lot of resources to get started and was just an great guy all in all.
I would write something about how great it sounds, but alas I do not have any pro bias stax here at the moment, so that will have to wait. Cheers.