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It is definitly possible to build a layout under these conditions. I once belonged to a club that was in an unheated second floor over a general store heated by a space heater. The temperatures varied from the low teens in winter to well over 100 in the summer. The way to avoid the expansion problems that the others talk about is to leave the gaps at every three foot flextrack joint. The joints are held in place by rail joiners that are not soldered. Run a feeder to each section of rail so that you are not depending on the joiner to conduct the electricity. With this set up each section of rail can expand and contract on it's own. The problem comes when long sections of rail are soldered together forcing all the expansion to the joint on the end. Hope this helps.
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