I just got my 20W S1 this week after their nice sales. I used their XCS software a little bit tonight and was able to use a grid array to create some replacement windows for one of my buildings. I tried cutting some .020” styrene but I would not recommend it. The fumes are turbo nasty.
I may order some of the material John was kind enough to post above. Right now I have some heavy card stock on its way to me and some adhesive backed RC board from Rail Scale Models in .017” and .020” thicknesses coming too. I want to make windows for some upcoming projects and I’m thinking .020” is a good thickness (just about 1” in O scale).
Laser guided scratchbuilding here we come!