@TTBRIDGE , that mattress looks great! We are going away this weekend and will sleep at opposite ends of the van to ensure a goods night sleep.... Because of the comfort factor.... Did you happen to draw up plans for the new lids as well? I would love a copy if you did! That's the next mod before the extended Xmas holiday.
@SPARKI, i did not draw them up. Made it up as i went along. But i remember the measurements. 950 long x 370mm wide, it "light"ply wood and is 12mm think. The pine was dresses at 20mm thick, sides were 70mm high at the front (DB end) and 50mm at the back.
It may sound odd they are different sizes. But the bed base (expanda floor) does not go completely flat, so if you want a flat bed the boxes need to be tapered. I then screwed it up from the bottom and used the handles from the lids are they were going to be covered over.
We have kept the old bed, as everything we have done is completely reversible if we decide to change one day and want to keep the mattress.
Good luck with the mod.
Tim