OK, 1st things 1st, I gave the rear of the van a good clean, and waxoiled as much of the arches area as possible, paying close attention to cramming as much through any holes as I could. Next, a few coffees and some cigarrettes later, I decided that the OS panel would be the easiest to start with. My reasoning behind this is, I'd like the floor to be removeable in case any welding needs doing, so that will be a 2 piece section that goes in last, held in place with an angled metal strip at the back door slam plate. Therefore, the build should be something like OS panel, NS panel, Bulkhead, roof and wheel arch boxes, then finally the floor. I`ll be leaving the SLD for now until I source its replacement.
So, after a bit of rough measuring and cutting, I come up with the following template; NOTE: The grey lines are the structural bits behind. Its handy to know where to drill and screw onto!
Just realised, the van is a 100 SWB NOT an 80. Dont think that will make any difference though...
Please note, this is pretty much the easiest amount of cuts and with a simple box arch. Of course you could try and be smart like I did, and try to angle the wood around the arches, but without a proper angle tool, I decided to just box them. If done carefully enough, the section you cut out for the wheel arch can be your basis for the boxing section. All you have to do is to build the sides and top. I decided against this as I need the arch to be strong, so will box it in with 10mm ply.
Next, a quick spray of adhesive on the panels, and a very roughly chopped up loft insulation roll (called Space Blanket or something...less than a £5 per roll from Wickes), a dab of gaffer tape to hold the weight of the insulation, and we end up with the following;

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