I now have my sawstop all set up facing my SCMI slider, and I have a nice outfeed table between them. Here are some pics. All the detritus in the background will be dealt with soon enough.
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The outfeed table started out as a 4'x8' solid core door I got from the ReStore. I laminated a slick PVC plastic on the top and cut it down to size. It is attached to the rear rails of the saw as follows. The rails have holes every 8". In installed threaded inserts into the bottom of the outfeed table to match up with the holes in the rails.
I put in long bolts from the bottom with a nut above and below the rail. This way, I can precisely adjust the alignment of the outfeed with the saw tops, and adjust for warp in the table.
I have not yet cut the clearance slots for the miter slots.
Also, that is not my final dust collector- I have a big cyclone I will be setting up, but this is a stopgap that I have laying around.