Only just seen your workshop project and as a thought, would comment that most steel building frames are bolted together using junction plates and have some diagonal bracing inserted both in vertical and horizontal planes to prevent the structure lozenging. Quicker than welding and also makes it easier to dismantle if alterations or relocation needed. Your cladding may give some diaphragm effect, but diagonal bracing is more certain.
Also what stops the building lifting off if you are caught in a gale with the doors open? Are you infilling the floor frame with concrete or some kind of precast unit ? If not, you could probably do with a few foundation pads around the perimeter in mass concrete to hold the building down. Don't underestimate the power of the wind! The problem with most lightweight structures is not just holding them up, but holding them down in storm conditions.
Generally (in UK) smaller buildings on dodgy ground are built on a reinforced concrete raft.
Apologies if you have thought of all this already.
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