I've done this with the same winch you describe. It was in my last Attic/Garage before we moved to our new location.
I kept all the rigging etc. and moved it to my new location.
I will try to get some pictures of it up soon, although I haven't re-Installed it at our new location.
Two keys to this project I think are having ONE: ability to have side to side movement to align the lifting mechanism for your top. This way when you drive your car under it you don't have to line up, spot on.
TWO: use a lifting bar underneath the top on the side pins. This will avoid distorting the top when it's hung for a long length of time.
I'm really happy with the way mine functions. I feel very confident on it's safety. I also built almost all of it from stuff I had laying around my garage, but even so buying all the stuff new won't be much cost at all. the winch will be the bulk of it.
Mine is mounted on small angle iron tracks in my attic floor and the cable runs thru a slot I cut in the ceiling. I doubled the cable back to the winch, this slows down the speed and increases the lifting capacity. You don't need anymore capacity really but slower is a more comfortable speed I think and does it perfectly fine.
This has increased the "top-off" option on my car many times over! And it's a one person job. I also rigged safety straps from the ceiling to store it over a long time.
Only problem is I have to get busy and complete the resto on my soft top!.
Pictures soon, I promise.