Cork is down. This is 1/16 cork from a big sheet, just cut into strips except for the turnouts, which were done by putting a turnout on the cork and cutting around them.

Next step will be pre-wiring some of the track with soldered feeders and laying it. I'm planning on starting with the Midland Sub. section that has the cork. I purchased PCB ties to use at the joints of the modules, so when the layout is dis-assembled the parts can be easily separated, re-connected, and to ensure electrical continuity over the gap.
So.. I need to think about how to set up blocks--At the very least I will isolate the Midland Sub from the I&O lead and McCullough so switching can take place independently. I may have a train parked on the Midland Sub while doing switching as well. Not sure if I really need to isolate the B&O Main 1 from 2. And I'll probably isolate the Engine House tracks from the yard and lead so there can be hostling done while switching in the yard takes place. So three main blocks.
Signalling (CPLs on the Midland) will all be manual--rotary or slide switch for indication, not based on occupancy or any fancy electronics.