I have a steel insulated building I would like to convert into an aviary. It is 10' X 16' divided into three 5' x 10' sections. I was thinking about building an 8' X 16' flight pen off of the back. They would have access into one of the sections in the winter I would shut them up into the section. Would I hang a few heat lamps and put a closed window on the opening? The section has a 3' x 4' window. The walls (in and out) are steel panels with over an inch of insulation sandwiched inside. So no drafts. Any suggestions? Was thinking about weaver birds, african waxbills and or lovebirds.