I built my second iteration of a fully enclosed system. I was a lot more challenged in that the only location was on the grass of my rental home.
The final version I expect will be made of fibreglass.
It is lockable as well as waterproof as is. Fibreglass will be long-living.
It has been set up internally for positive air pressure with an air gap between the outer layer and inner layer. I have an input air circulation port underneath but am in no hurry to develop a cooling system as winter is coming.
I was planning to use my wife's business to sell these, but I haven't done any final determination as yet.
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