My next stunt is going to be wiring straight into the SATA plug off the Corsiar power supply's 5 volt rail. I don't know what the rating is on the TP1's 12 volt to 5 volt supply is, but I'm thinking seven fully loaded Pi 5's will probably blow something up quite badly. And since the boards are not being made (hey Turing Pi people, do another run!) I'd have to backfeed my own power supply in to get back under steam.