Stalker, not sure where the space problem was, I hunt out of a doghouse a far amount and have never had space problems drawing? I do have to put in the ceiling poles to raise the roof enough to not tap the top of the bow. I shoot a 40" bow with a 29" draw.
I even have had my young sun in there a few times, that makes it cramped but as long as he is in one corner I can still shoot. As for the small windows if you get the TSC model it has much larger window panels you can put in the openings. How big of a seat did you have in there? I use a very small swiveling stool.
You might want to give it another try. If still to small there is the penthouse model which is huge and has twice the window openings.