I have the Ameristep Penthouse--is that the Penthouse you are referring to?
Yes I still have that one. I found it great for shotgun and fits all my gear great I just can't find a comfortable shooting angle without my elbow hitting fabric or the bow hitting the window. Also in any wind over 12mph I find it extremely noisey.
Does anyone know if the double bull is strong enough to hang a bow from one of the top supports? or perhaps that is already included in the design I don't know.