Garage heater problems!!

Thanks guys, Im gonna start a new thread to get opinions as far as the insulating.
Scott I got the heater from TSC on sale. 30% off, I believe reg price was $649, so around around $450 plus taxes. I went with the LP and it can be swapped to NG with the conversion kit, which I bought last week for $30. Im gonna start the new thread with pics.

Thanks!!