MY Dolphin has a window---it has an eve of about 6 or seven inches. The rear cap stands out from the rear wall by at least that amount so you need a window and a window box if you will. There are braces running horizontally across the back wall but I have no idea if they would interfer. I know they, or the ones on my Dolphin, are steel and you can locate them with a magnet.
Honestly the full time we have had our coach I do not think we have raised the blinds on that window except to clean it. We do use the daytime shades for addition light.
Good luck lets us know how this goes and pictures are much appreciated.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)