The 38DD plans I just used the instructions on how to get a digital thermostat to work. Mines a $20 Honeywell from Walmart, but it was the same as far as lengthening the leads to the thermistor goes. The SoF plans I used the dimensions, though I had to shuffle the pieces around around since my 9'x14' RMax insulation board was cut in half. Still worked out though since I had to mail the pieces to myself here in Sicily. RMax isn't what was called for, but it seems like it should work. R-5 is the about same R as the foamboard, but I'm only using 1" instead of 2. Probably means ice will only last 1/2 as long, but there was no way I'd fit 2" of the stuff in the mail. Got my Hawaiian punch bottle icing in the freezer for the test run tomorrow.