I had similar with moving home, and dismantled everything.
My Myford Mill and Harrison L5 lathe were still in bits from having acquired them. The Myford lathe was on its cabinet in the kitchen but once separated from its cabinet, the removals men could carry each easily enough. (I think I took the motor and controller in the car.)
For re-assembling, luckily I have a small collection of scaffold tubes and clips so was able to fashion frames from which to suspend blocks-&-tackle, and on which to clamp a trailer winch. These were accompanied by lots of blocks of timber and some jacks. Plus plenty of planning the lift at every stage.
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This was almost all single-handed.
I tried as Hopper suggested, "get a few mates round" – you'd think your own model-engineering club with over 30 members would rustle up a couple of volunteers to help a fellow-member. I had no replies, from any of them! In the end my nephew helped me with some of the lifting.
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I would say one thing to really take care about, is re-fitting the table to the mill; to avoid its own weight unfairly acting on it like a big crow-bar until you've pushed it to its mid-travel.
Also beware of losing keys! There is a Law of Nature that the key needing to be lifted out of its recess won't; the one intended to stay put will make a leap for freedom.
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On floors – my present (oh, all right, final) shed is of concrete walls and floor, and came with a house. My previous one was an ordinary wooden garden shed I lined out' but to take the weight of the machines I had then ( a Warco mill on an angle-steel stand, and a Pools lathe) I cut holes in its floor and built shallow brick columns on the underlying concrete pad. The machine stands were directly on these, though with thin plastic pads interposed as shims / damp-proofing. Some plywood patches covered the holes against draughts and mice.