so far the  MB1 amplifier (12ax7 & 6aq5) and the small speaker power output stage (6aq5) are built onto an ugly custom stripped out chassis. its chopped up  to  fit neatly into the lovely old skyqueen cabinet.  it sounds great even with it’s very temp/experimental control  wiring. just need to  drill and letter stamp up the panel, anodize it.. and finish the build. the ugly chassis looks like many  50’s european radios . those crazy germans made the ugliest most dangerous looking electronics   …placed  inside beautiful veneered plywood cabinets. u just dont see  that stuff being made anymore. if anything has curves –  safely assume it is moulded plastic.