Some pictures...
Base Plate, with area milled flat where the IGBTs will go:
3 600v 600amp IGBTs:
copper, nomex, copper sammich. hmm hmm good: haha
With enclosure. Enclosure is around 4.3" tall. The 3 capacitors aren't here yet, so I can't mount that:
Nomex, all by itself. 20 mil is considered safe to 800v. The hole pattern is symmetric, so I could mill the top 3/4 of the holes (all my mill could fit), and then flip it, and mill the bottom holes that had been missed:
And it's cheap too! Here's where I got it. That works out to like $4 per controller for the isolation material:
https://shop.eis-inc.com/sap(bD1lbiZ...nbr=NMX4102001