It would work but you will need to be able to monitor the temperature and open it up for ventilation as it will get too hot very quickly on a sunny day. Heat is often a bigger problem than cold in a greenhouse. As long as you are around every day to keep a close eye on it, it could work but be prepared for 40 days of high maintenance.
High winds or thunderstorms if they happen could do a number on it. you will need a nearby source of water. (or you will have to haul it) and 50 5 gallon buckets will need a lot of water.
KO
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