It’s 25m Long and saw tool shaped from 8.5 to 5.5 m. 600 deep. Or 24” for you Americans. 125 slab under main slab and recessed slab. Sand would really be an option. Steel would probably cost more than lumber. Thanks so far for the ideas. Again temporary (basically 6 months) of use. Occasional 2500lb scissor lifts driving and working on it. Again 225 lb/sq in is the weight rating on the lifts. I’ve almost convinced myself 12” -16” center 2x6 spanning 4’ between stringers would probably be enough with he double sheeting. Keep it flowing though.
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