I know of a couple of PC sailors on the Yahoo list who have used a lift. In both cases, ramps were not available.
After consulting with Com-Pac, they both reported using a bridle system attached with carabiners to the shroud chain plates and aft mooring cleats. The first guy emailed Gerry in 2008 and was told that Com-Pac lifts the boats this way at the factory, empty of course. Gerry felt that the pad eyes were probably OK, but recommended that he install additional pad eyes aft since the cleats aren't designed to be used for lifting. The owner didn't want to install additional pad eyes.
The second owner called Com-Pac in 2013, and they said it would be fine to use the cleats. He did decide to have additional pad eyes installed at the stern. He had Defender make up a bridle to his specs using four 3/8" Dyneema, each about 80" long, spliced to a sling link with carabiners on the ends for attachment. At the end of the first season, this was a new boat, he reported that the system was perfectly balanced and had worked great.
Besides the wood screws, the sheet attachment is a 3/8" bolt threaded into a nut welded on top of the SS centerboard trunk. Should be good, but it's hard to inspect. Not sure about balance.