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My guess for the double wall is reinforcement. Fill it with rebar and cement, backfill around the structure with dirt and pour a 5-6 inch floor.
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Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
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