Unfortunately I didn't get any pics of the bed seat fitting but it was a pretty painless process. Again, there are a few places who make the beds. I went for one made of steel in a Worksop buy a guy who has made hundreds. He's adapted his design over a number of years, and the latest version fits neatly to the existing floor mounts (so no need for additional welding etc), it has a high seat back (for extra comfort) and also includes seat belts. The total cost including the boards and high density foam made to measure for the upholstery to as £465 fully fitted.
Upholstering the Boards
Following the mon's tip I bought some leatherette fabric from Dunelm Mill - only about £15 for 3 metres worth. It handily comes in 1.4m width strips which happens to be just about right to cover each board.
Once again, I headed to Dave Lowe's to get the table put in ready for our road trip at the weekend. Not a difficult job - at least for Dave.