Greg- Overhead cranes..... They were in our warehouse when we bought it.... They come in handy for things like this!
Grant- 2 separate cranes- 10 Tons each. One 10K lifting sling through the bow eye to one crane. 2 10K slings through the rear lifting lugs to another crane. Nothing supporting the bottom, just those massive welding tables in case something were to let loose, but I think the lifting components are so overkill there's not much to worry about.
And yes, the lugs on the boat are designed to lift the boat like this....