I've been given the dimensions and they are to be 36" X 36" X 8" Tall. Since it can move around from room to room to concert hall, it needs to be as lightweight as possible, yet strong enough for her to stand on and move around. For safety's sake, I'm intending on building it so two people of large size can stand on it in case a kid joins her univited on the platform.
I'd like to build this using the materials I have on hand, which I think should be doable. I've got plenty of 3/4" Plywood and 1/8" hardboard. In addition I have various lengths of 2x4, 1x3, 2x2, etc, but not enough of each to do much with it.
I was thinking a torsion box would be perfect for this setup. However, I'm not sure of what materials to use to minimize weight while maximizing strength.
Here are some options:
1. Hardboard top and bottom 3/4" Plywood frame with bisecting crossmembers forming 4 18x18 squares in the middle of the sandwich. Pros: Strong perimeter and crossmembers. Negatives: Probably too large spand for the harboard
2. 3/4" Plywood Top and bottom 3/4" External skirt hardboard honeycomb center on 9" centers forming 16 9X9 squares in the middle Pros: Probably heavy, probably strong Cons: would hardboard be adequate as the honeycomb material from a strength perspective?
3. Some sort of hybrid I haven't thought of.