Hi Andy. Might I ask what solvent you tried for polystyrene before? I saw a deluxe bottle in background before and wondering if that had been the problem, other than that I warned Maquette styrene is a bit different from "regular" polystyrene sheets. From experience I just hope you reinforce those joints. I think cutting windows is much easier before the parts are bonded. To do it after you make a hard job look easy! It is coming together nicely and polystyrene sheet is so nice to finish and prep for paint, so much less effort than ply but each to their own.