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workshop foundation on peat

I want to create a dirt floor for my 6000 x 7200mm workshop with 1000 x 100 ish floating concrete pads on each corner to bolt the bottom plates too. I want to add cross bracing under the dirt floor through the concrete to help keep the shed square over the years since we are on old swamp land (peat). cross bracing I'm thinking rebar. i can only cast and build above ground without breaking the soil. but trying to figure out concrete mixing on my own is really hard since I need about a square meter of it and I don't want to order a pre mixed truck as I am on a tight budget. Plus I have tried to organize concrete before with no luck during these busy times. Can someone help me with figuring out what and how much supplies I need.