I found black polysulphide sealant in Jewsons in tubes that fit a standard frame gun, took the advice and put in an outer thin bead of sikaflex 221.
The drive is now fitted, bleeding the steering was a pig! Still have a few bubbles in it but its solid enough, lift/tilt rams were thankfully easy!
Sadly I`m off to sea for a month tomorrow si I won`t be doing any sea-trials until end of July. Hope the weather stays fine.