Where are you going to install the hoist and storing the top?
Garage? High or low ceiling?
Many have put together some pretty neat DIY systems with pulleys, ropes, and a boat winch. I was going to do the same, but by the time I priced out everything I would have to buy, I just bought the Lange Hoist a Top online. It was only $150.00 at the time for the manual lift (come-a-long). You can get an electric powered winch, but I hardly ever put my hardtop on, So the manual winch works fine with me.