Thanks for that, looks good. Definitely interested.
Primarily wanted for split level storage, for camping and outdoor kit. Two boards would be more flexible, but think it would be ok to cut down the single board, as long as could support the centre edge when in bed mode. I think Vanking two board models have 4 rather than 3 cross support rails for this - but sure I could sort something similar using the single center rail.
Would like to come and take a look, will send pm later. Based in Cumbria so not too far to travel.