rockweasel
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18mm is way too thick, sandwich something even if it takes a bit longer to do, really depends on how cold a temperature your going to camp in, don't forget ventilation!
A typical Scottish spring and autumn weather is what I have to sleep out in.
Windows and an air vent I can source from camper and horse box suppliers. Plenty on offer to choose from.
18mm was what I saw used on a trailer build, however come to think of it they didn't line their trailer with anything else, so there was no framework to stiffen it. The 18mm they used was structural.