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@pdlouche
I had about 10 tofus made, and there was an issue with the machine. TLDR, gonna be delayed.
CSB, of the three or four main worries, the resistors did the thing. They were running way too hot and I was on borrowed time running them to failure. Finally ordered some higher spec. The ceramic 10W10R's +/-5% are identical to the ones used on motorcycle indicators, so I have a set, but I don't trust like-for-like. These were running at 10R all the way to failure, but I hope it's not a symptom of a power issue further back on the circuit.
Ordered some 50W10R +/-1% chassis mounted Vishays, to be wired remote from the pcb. It's going to be busy this week but hope to fit them by the weekend and see how the machine responds.
(*50W's to have the largest surface area, and a working range of at least 20W if thermal coupling to the chassis fails. Ideally, running cooler, for longer)