I now have a semi completed sleeping platform for my aft port cockpit side. The sleeping platform slips under the thwart 3cm coaming overhang and then rests on the slotted uprights. The whole lot can be taken part and collapsed into the floor well where flat straps hold them secure.
So a bit more sanding and then several layers of varnish. finally some thin neoprene strip will be stuck to edges to act as 'cushioning'.
I look forward to testing it come Easter!