If you're a woodworker, you can go with a torsion box design - overlapping 2x4's into a grid, say on 12 inch centers, with half-lap joints that can be made or broken without glue or connectors (for portability). That should support 1/2 or possibly 3/8 sheeting - I'd be very wary of 1/4 sheeting - it MIGHT be suitable on 12" centers, but it won't support 100 lbs or more on 18 or 24" centers for any time without sagging.
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