One thing to consider if you purchase a hard top hoist: You are still going to do the same amount of installation with a store bought hoist as you will with one you make. And you are going to pay a LOT more. My hoist consists of a Large eye bolt a few pulleys rigged in a block and tackle type configuration, an additional pulley at the ceiling where it meets the wall, and a cheap boat trailer winch. All purchased for under $100. I used ratchet straps to support the top.
It helps if you are under the top as it makes it a one man job. I am off by a few inches, but I can still back under the top and lower it with the winch while pushing on the side of the top to line it up. Any more than that and I can't advise how hard it would be. My hard top stays off most of the time, but I can put it on and take it off by myself. Since it's only suspended by one eye bolt, it will rotate when hanging so I use a small tether rope attached to the rear of the top and to the wall to keep it lined up. When I get it off, I lower it to the ground and run the straps all the way under it so the ratchet hooks aren't putting stress on the fiberglass edges where they hook. Plus it just seems more secure for long term.
Another option that I used for my wife's JKU is a hard top cart. My LJ top is heavy and awkward. It's difficult for even two people especially with a 4 1/2" lift. My wife's JKU top is surprisingly light. My teenage son and his friend snatched it off with no effort at all. I have limited space as well, and it fit easily in the space in between the two Jeeps.