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Shed manufacturers tend to be slightly inaccurate. Also, the footprint of the floor is generally a bit smaller than the overlapping cladding. I would suggest a lip of 4" per side. I generally suggest a 2 degree fall across the base to prevent water sitting under the shed, set this up with the shuttering.
ColinTheBald
seeing as you're on Colin, I'm laying a slab for a 6x8 shed in the summer, with a few courses of bricks to raise the shed up as well. I'm pretty confident on slab technique/prep etc. But would you recommend sizing it precisely to fit the shed or leaving a lip around the outside of 6" or so?