You only need a couple of degrees ambient to be ok. 74ºF is ok for ambients. so it should be fine even on the odd occasion below that is fine but it becomes an issue if it is for extended periods.
I would advise to use the best material possible. The amount of time and effort you put in has to be worth something. I personally would avoid melamine, it is cheap, not water resistant, hydroscopic (absorbs water vapour), has potential off gassing issues, is not overly strong, is overly heavy. The only positive is it is cheap. Almost any material IMO is superior.
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