I finally decided on how to store the sleeping boards. Have added too battens each side of the hatch. These not only raise the boards but stiffen the aft tank.
The boards will then be lashed to the top of the battens. This not only solves storage but protects the hatch a bit for rear re-boarding.
Have added D ring tie down like used on Ribs etc to the bow tank. These will hold the buoyancy bag nice and low in the compartment
Next lots of epoxy work
Lots of old fitting holes filled with epoxy / carbon / colloidal silica
The top of the rear tank battens got a layer of Kevlar tape to add more stiffness
The rear tank hull joint which I suspected of leaking got a nice fillet of epoxy / colloidal silica and then some new tape.
The bow tank has now been glued back on, some temporary screws ensure the hight is equal. The small hatch I’d going in the top allowing for internal taping and local reinforcements for the bow fittings.
Finally little outside job, one side of the trailer had broken and so fixed and reinforced the other side