you lay out a bed of rock salt,
(Using it as a mold to get unique shapes and not have just flat bases) kinda drip the concrete mix onto it until you get the shape you want?
( Correct, drip is good not compresssing it, but don't go thinner than 2 " anywhere, it won't hold up) is that right? then let it sit for a good 2 weeks before i move it into the bay?(
It only needs to sit for about a few days to get a cure stong enough to lift carefully, but I read salt water weakens the concrete curing process, so yes wait at least 10 days before putting it into salt water. Lucky you close to the bay! That will be so much easier and faster than what I am doing. )