Hi Bruce
I had a spare SX-1 adapter that provides 3 of the card edge connectors.
One is destroyed by the blower, one is used to connect this interface to the console, and the other is still waiting for my next attempt at salvaging.
For the one in use here, I lost a few pins including some upper address bits I think, just none that were needed for this circuit.
I might have had a go at a 68030 accelerator as well if the connector had come off in one piece.
All of the signals you got from ROM socket & test points are also at the edge connector of course.