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Two observatories here, differing floors
Wife's
freight pallets on concrete with 12 mm plywood on top,her wheeled ob chair moves easily. Just pack the pallets level on you funny shaped floor & cut to shape.
Mine
20 mm deep interlocking plastic pallet like squares on concrete, cut to shape,topped with interlocking solid eva foam tiles. Dropped things don't shatter and the pallet layer gives ventilation.
All the plasic is expensive,the freight pallets were from local merchants piles of non returnable pallets,free. We had the plywood from a previous project.Marine ply is the go as it should not rot, just paint well.
Chris
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