Attached Link: http://www.floorplan.com/

You could put some glass textured 2d faces where the windows would be. And don't be shy about putting a roof on there and using light objects to illuminate the room, or the sunlight from the window. As for the bay window, you can get a cheapware program called Imsi Floor Plan that will build entire houses and has a wide array of preset bay windows. It saves in .dxf and imports into Bryce just fine and you can retexture whatever you like. I actually got TurboCad7 and Floor Plan 6 in a bundle at comp usa for under $50.