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Excellent, David! One risk with all-in-one PCB is noise propagation from the high power switching. I suppose that with clever ground planing and star topology noise can be reduced. On the plus side, beyond the ones you mentioned, one PCB reduces capacitive loading and timing issues which is critical. Perhaps a combination of both where the drivers are close (on top?) of the IGBTs but being driven from a micro on it's own ground plane and out of dodge would be good.
If at all possible, I'd also include space for a chill-plate or liquid cooling of some sort. I've always wondered why most drive designs don't put the heatsinks on top where the heat is naturally going. It looks kind of upside-down with the IGBTs "hanging" but it should help some to take the heat away from the switches and other components.
Looking forward to the schematic and PCB layout. What schematic software/format are you using?
JR
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