Hearing of the heat issues I added a fan. 5V using usb.
Which necessitated stand offs, and ribbon cable.
Which meant a mounting system (styrene, 2mm).
Result is not pretty. It runs cool and works. Ribbon is M-F, oddly the connectors
don't fit in between the stand offs - pcb holes too tight (Eben?).
https://drive.google.com/open?id=1HxpJT ... mY3tTszmX shows the ribbon path
which makes the bodge even worse.