First couple of styrofoam layers

Today I cut the first two layers of styrofoam for my N scale layout. There is a 2" layer on the bottom - basically structural as it spans between the wood supports. Then a layer of 1 1/2" styrofoam on top. I use something called PL300 glue which is safe on foam. Other construction adhesives will melt right through the foam. Yes - they really do. I put a couple of weights on top to hold things in place and exert a little pressure. Tomorrow the glue will be set and I can cut another couple of pieces for the other end of the "L". Yes - the styrofoam does extend above the window sill so I had to cut a little for clearance. But since we never open these windows no harm. Also, not sure I blipped this, but I put a UV film on all the windows in the room. The sun here is so strong that it would attack the paint and models without some sort of shield.