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I think the correct answer depends on how much weight you will be putting on your layout. If you are using almost exclusively lightweight materials such as foam, a good-quality 2x4 frame should work fine; if you are using much Hydrocal or equivalent; a wood frame would probably sag. A technique that I've seen used successfully is a marriage of the two materials: a 2x4 with a THICK piece of aluminium angle screwed to the inside.
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