I want to recess/bury the Rokuhan bed/ties and wanted to see if there's a good way to do it. My first thought is to carve out a recess in the foam and then use Woodland Scenics Smooth-It to smooth out the area. Creating the grooves to clear the train wheels is something I haven't figured out how to do. Should I sponge out the excess or use a dental pick to scrape the groove out before the plaster dries? How carve-able is the Smooth-It plaster after it dries? I've attached some photos of what I want to achieve and wanted to see if anyone has any tips/info that would be of help. Or is there another material I can just cut out and glue it to the layout -- like thin foam sheets, thick cardboard...? Thanks!