I didn't see this until today. I had just ordered parts to build a 2xKT88 mini-Major (but not Marshall cosmetics) and then saw this. I'm going to use a Ceriatone Hey Watt chassis so the enormous transformers are at opposite ends of the chassis. This also puts the preamp tubes at the front of the chassis. Plus the Hey Watt has the Master Volume right there on the front panel. Also since it is a 100W chassis I can spread the power tubes apart for better cooling.
Chris Merren just so happens to make a 'mini-Major' OT just for this. Then I'm going to use one of his 100W power transformers to try and get 500vdc or more on the plates. Gonna be fun, can't wait.