I finally made some room and bartered with my old lady and this is what I have to show for it. Now my huge texas and FH can mate in peace and have plenty of room. For the background I used a couple rolls of soft black foam that I found at a fabric store. It doesn't reflect the light, which I hate. I think it was called Foamies. It feels like a beer coozie. Just attached with clear spray adhesive and taped the seem and top and bottom.
Great job, they'll love the room.