Just a thought, would it not be wise to mount your ply motor blocks in a way so that the motors can be removed if need be shoud one of them dies a death?
As if you simply epoxy the mount blocks into place on the hull getting a motor out could well be a nightmare
no problem, motors are simply screwed to the bracket
already had to dismount the motors for treating the inside of the hull with pore filler...
This is what I was saying, the motors are simply screwed to the ply bracketsl in your assembly and the brackets are then glued to the hull with epoxy are they not?
It may be later difficult to access the removal of the motors from these brackets due to poor access and so he wont be able to remove the brackets from the hull either as they will have been glued to the hull.
This is why Martin is talking of a removable arrangement as if the access is restricted to the motors even with the removable deck then it will be fun getting the motors out if need be.
If you think it will be okay then fine, but if there is a chance it is not then it is a mess to put right later