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I prefer 1/2" ply because it's stiff enough not to sag when supported every 16" or so but bendable for vertical curves at changes in the grade. 3/4" won't bend and 3/8" is too flexible. By the way, 11/32" ply would be undersized 3/8" not 1/2". Last I heard, plywood is supposed to be its full nominal size. Then again, I'm old enough to have worked with 2x4's which were 1 3/4" x 3 3/4" when I was in grade school. I'm planning a new layout and this one will be a combination of steel stud shapes for the skeleton and 3/4" x 3" cut from birch plywood for everything else. The subroadbed will be splines ripped from 4mm luan or baltic birch.
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