I am still in the planning mode. I have a wood playhouse I am converting. The inside dimensions are 42" x 69". It is currently made of 2x4 framing with T-111 siding. Am I ok on the following: Room to have 4 birds? What would be the maximum amount of birds for them to have a good comfort level? Is 1 2x4 roost 42" long enough for 4 birds? Input needed: The playhouse is currently not insulated...it is bare studs on the inside and the siding on the exterior. I am in the Pacific Northwest...do I need to insulate and put interior sheet material up? I can if I need to, just won't if it is not necessary. Is 1 nest box enough for 4 birds or should I have 2? Thank you for any and all input.