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thinking about this..the idea is really cool. sawcut oversized, so you can form up the sides. i would pour a 4 inch slab with standard, home depot rebar. drill and dowel into the sides of the existing slab. bend it down to match the new slab. i like gravel beds below concrete.
then have a box cover fabricated so you can keep it covered when not in use. it would be cool.
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poof! gone
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