I can certainly make a cushion that fits in the window, and I think it already has slots so would probably fit in without cheats. I don't think however that it would be usable. Maybe. But I don't know. LoL I need to double check the window. And being slaved to Jonesi's blanket sounds good, but obviously wont' work with all textures. Would that be acceptable? I would like to attempt to add shading via another mesh/texture too since I've never done that.
I will see if I get time to poke at those pelmet drapes too, shouldn't be too hard since I can clone the existing ones. But of course everytiime I say that it takes forever! Just like the hot tub I just finished.