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Seal all your electrical connections with liquid plastic tape to offset rust/oxidation of your connections. The thermal expansion/contraction of different materials could cause a problem. Temperature swings in an insulated, somewhat climate controlled garage are noticeable - a true outdoor layout would see more. I don't think you can use glue for an adhesive. You will need to use an indoor/outdoor type of adhesive for track, roadbed, etc. Solder every possible rail joint because of oxidation and expansion/contraction. Dont just have empty insulating gaps, use plastic insulators. I wouldn't use wood for structures, that will expand and contract as well. I don't think it is impossible, but your maintenance will probably be 4x that of an indoor layout. I would keep it simple - no big yards or a switching maze. Just a point to point or oval with a small support yard and a few industrial sidings. Good luck!
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