Hi,
I have exactly the same lathe as yourself, with the same sort of problems. Actually I have had two, I wasn't happy with the first one, so they had to come back and swap it over.
Both times it was moved with an engine hoist, bit of a pallet and lengths of plywood sheet. There is no easy way around it.
The first time it was installed was by a moving specialist, and took about 3 hours from getting the machine off the back of his truck to actually having it in position in my shop, at a cost of 300 squid (but that included a lot of travelling costs). The second time it was free and Chester UK did the humping, with a lot of advice from myself. Without it, it would still be sitting on their truck, and it took them about 6 hours. The main problems is going up and down steps, and having to dismantle and reassemble the lifting equipment.
The motor can come off to reduce weight, but you need to leave the saddle on to balance the head end.
In all honesty, if you could hire four strapping lads for half an hour, a couple of strops and scaffold bars, it could be off your truck and in your shop in less than five or ten minutes just by manhandling it. As soon as you start to use hoists, trucks, jacks, sheets of wood etc, things get very awkwards, very quickly, and it can take hours.
This is how the chap got my mill into the shop, 4 hours, and most probably only half the distance you have to go.
http://www.homemodelenginemachinist.com/index.php?topic=2314.msg23091#msg23091He was the one that moved the lathe into the shop, but I didn't get any shots of the progress
http://www.homemodelenginemachinist.com/index.php?topic=2314.msg24991#msg24991You have a major problem on your hands, all I can suggest is don't bother with the gantry, go manual.
Bogs
Bogs