Hopefully the link works.
Instead of the plastic tray I have now dodgied up a drawer out of ply.
For the whole thing I made some brackets for it to slip into the original slots at the back to stop it moving.
The battery box fits in the bit on the back right and plugs up to the car and fridge. Fridge sits on the middle bit and straps down to the angle iron bolted there. Boxes sit perfectly on top of the drawer bit. All in all everything fits perfectly and I seem to have more spare space now which is good.
As for the chair, I preferred to have a chair that squishes into a bag, it's a nice chair too. The other folding one is good but takes up too much bloody room
https://flic.kr/p/KqtXR1
Sent from under my Grand Cherokee