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Hinged legs or chains from the ceiling both seem like a winner. Use some gate hinges to attach it to the wall? If it fits into a corner, you can screw a block to the wall and skip the leg in that corner.
If you need something heavier than the door core, most big box stores have prefab Formica countertops in incremental lengths. I think the one I used for a work bench top was 10' and all of $30, as they were discontinuing the color.
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