Thanks, it takes place at 11:45 tomorrow.
I applied light spackle to the cracked Gypsolite and it has worked to both close the cracks and level the surface some. I pre-colored the spackle with W-S Earth tinting liquid. It was a sloppy job, but I think it will work well once the ground cover is applied.
It was good that I use tile grout for the street paving. I've had to scrub it repeatedly to remove unwanted "dirt" from it. It's tough and can handle learning well. If it was just painted Bristol Board I would have worn through the paint. Therefore, my recommendation of using pre-mixed acrylic grout is a good one for paving roads realistically.
Since tomorrow's "Root Canal Day", I probably won't get back into the shop until Monday. When I do, I'll get into ground cover and landscaping. I'm also going to start getting the drawings prepared for the boiler house. Andre Garcia and I discussed the advantages of cutting from 1/4" MDF instead of the .155" Masonite. It's cheaper, smooth on both sides and is wide enough that you don't need tabs to hold square corners. I'm all for less expensive and simpler construction.