Got the hard top winch mounted up, just need to make some brackets to attach the ropes to the hard top.
Bracket to mount it on is 2mm steel C channel with the lips of the C sliced off, then bolted to the top rail, the vertical studs and the truss.
Winch is then bolted to the bracket, the top two bolts through the top rail of the frame as well.
Ended up doubling the wire rope from the winch, not for strength but for speed (or lack there of). Single pull is 10m per minute and double pull drops that down to 5m per minute. Means it will take about 15 seconds from vehicle height to roof storage height.
The knot in the middle is not permanent! Simply for testing, once I get the right lengths for the ropes I will splice a loop in them.