OK, additional info to report.
Today turned out to be dry, but chilly. Frost this morning but was 39F when I decided to make my first test. Plugged in the 1500W Hot Plate, hung the Maverick ET-73 internal smoker thermometer about half way in the middle of the box, buttoned her up and checked the reading. Was 40F and climbing so went in the house for a cup of coffee.
Half hour later, checked the temp. It was 61F. Gave it another half hour and it hit 91F. I let it sit for another half hour and it struggled itself up to 98F.
I don't think the old Hot Plate is going to be the way to go. Just too much volume to heat up, and this is without any food in it, to heat up
I have the innards from a Luhr Jensen Big Chief. Removed them when I converted it to Cold Smoke. But don't think that would be much of an improvement.
Thinking of going to an RV Supply house and getting a propane stove burner and designing something to hold that. Should be able to come up with something similar to my GOSM Vertical.
I think it is now time for all my brothers and sisters to come to my rescue, with ideas and suggestions.
I know this baby has some good potential and we should be able to make it work.