Dale
I noticed your comment about putting rubber between the blocks and hull to protect the paint. If you plan on having the carrier sit on the blocks for some time, I would replace the rubber with cotton waste. Over time and under pressure, the chemicals in the rubber can react with the paint and the paint will stick to the rubber when you get around to removing the blocking from under it.
Also, my Father in law worked for many years in the Transcona Railway Shops in Winnipeg. Whenever they had to jack up a steam locomotive (steam jacks in the day), they put a wad of cotton waste on the top of the jack to prevent any metal to metal slippage from happening.
David
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