I have had my boat for 30+ years now. Every fall I use this company to haul, de-rig, transport and block my P323 in my back yard.
http://www.simmsbros.com/marshfield-ma-boat-transport.htm.
My yacht club also owns and operates a boat yard.
Speaking from experience, if blocked correctly and inspected periodically, there is a zero chance of your boat "hanging" on the jack stands. Most damage occurs when the jack stands are not chained to each other, or tying a boat cover to the jack stands which can cause the stands "walk off", causing the boat to topple over.
I have friends that have transported their boats from NE to Florida, bow to stern to keel shrink-rap to protect boat from road debris.
The P323 cradle was an option at time of purchase and they were made out of wood, your chances are slim finding one in usable condition today.
bob