You were planning on Baltic birch? it is very stable and is unlikely to warp much latex is fine it just scuffs up more. I did not mean to come off saying it was bad just not as tough. LP would likely not need to be re painted for many many years latex may need a fresh coat every 5-7 years it really isn't a big deal either way. Ply is very stable especially BB ply more than most and it is water resistant. I have a friend whom unit a rack recently and used crazy carpets on the sliding part of the shelves and put the flexwatt on that. It protects the paint from wear and slides better.
I run racks in a cool room as well. Closed pvcx racks and in the temps you are describing it will help some but I would venture a guess that the temps will still be on the cool side. Your corns are ok with those temps right?
Have you given though to custom enclosures? It might be easier to heat as there are more options. The other thought is locate the rack in something like this, http://www.bluegrassgardens.com/port...reenhouse.html (image is the first one I came to.) and just try to heat a smaller area. Just thoughts with out having thought it through very carefully.
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