Thanks! I should have stated...the guy is only a year old. He's still indoors. This is just to get him out during nice weather. He will have run of an area about 4 times this when an adult.
I just wanted to say thank you to all who provided info for building these insulated boxes. It made for a fun project for myself and my 11 year old. Turbo is still a bit small to be out full time, but we wanted a safe place for him to enjoy these awesome central California spring days. Still...