Join Date: Apr 2011
Location: Southern California
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One can make a tough wooden cradle using 4x4s, plywood, bolts, and super heavy duty caste wheels (McMaster)
OP is correct that jack stands can deform hulls. If you make a cradle for you S21- you'll want to provide wide support forward directly under the main bulkhead. The aft support should be just aft if the trunk opening. The supports need to follow shape of hull at those points - requires a very high skill level of carpentry.
Under no circumstances would I rig up a contraption to hoist the boat in my driveway or backyard. D A N G E R O U S - ask yourself, would you hoist a car 10 ft in the air using a home made hoist ?
Use the cradle at your local boat yard - the one that charges you $25 for a hoist and let's you work on your boat out back all winter