hi Guys -
Glad you like it!
The internals are built with S&B Transformers, which no longer generally available, apparently are still available on a custom order basis (?) from S&B, albeit at a hugely inflated price vs. what John used to sell them for. Here's a couple pics of what the transformers look like by themselves, and the switch. These are other people's pics, not mine but they give an idea of what is inside the case.
The trannies are in mu-metal cans, with all leads out one end, as below:
The switch is a dual-deck one like this (which I think has 4 decks):
Wiring these up is a real pain, esp. when using solid-core wire which is uninsulated... have to cut all the wire to size then also cut insulation... plus all the soldering. Even just planning out how to route the wires is a chore, since there's so many of them. Somehow it all fits!