Greg,
I made a drying booth like yours out of a cardboard box lined with aluminum foil and a 100 watt bulb.
I am using it now and it only gets up to about 84 degrees whereas you said yours hit 100 right?
Are you covering the front of the box to bring that temp up?
Update: I just re-read your post where you showed your drying oven and it says you made it out of foam core.
Maybe that is why mine isn't getting as warm as I just used a cardboard box.
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon