Don't know anything about Hazel, but the small Norwood workshop looms were very like the Dorset. I'm not sure they are still in production, but they are available used.
I'm no expert on countermarche looms, but.. judging from the geometry of counterbalanced looms, the shed could be only as tall as the space between the heddle bars and the heddle eye. The reed should be about the same height. The heddle need not be longer than the jacks that control them.
The big looms fold somewhat, but they can be disassembled as well. You would still have to deal with the central "castle" area without disassembly. You sure don't want to mess with the mechanical jacks if you don't have to. The front breast beam assembly and the treadles can be removed, and so can the back beam(s) and brakes. Of course all the shafts come out too. Pretty soon you're down to something two or three brawny teenage boys can lift.
If you thought the Artisat was noisy, I don't think you'll like the Baby Mac. You don't say if it's 4 or 8 shafts, 8 might make it heavier than you'd like for a portable, although wheels are available. The wheels, though are a little small for serious wheeling. I tried wheeling mine along a brick sidewalk and it was a real wrestling match. I'll be making a new device for wheels before the next MAFA.
Then of course double check to make sure it is a folding Baby Mac and not a very small standard floor loom. Right now I don't think the Baby Mac is made in sizes smaller than 24"