That is so impressive - looks fabulous. My OH is working hard on gearbox and curing rust and respraying. He has done an amazing job on interior but the seats are dreadful, threadbare and bursting. May I ask how you got the 'template'/pattern for the sear covers? I can sew but hopeless at working out how to do things. OH just looks at things and he knows what he is doing. He recarpetted the whole of the van and like you we took out shares in spray glue. Yours looks amazing.
Not wishing to risk my seats ( if it all went horribly wrong ) I brought a pair of old front seats that were in a bad way. I think I paid £40 for the two. By coincidence they were also out of a Holdsworth conversion. I disassembled the old covers and used them as patterns. I choose to use brown vinyl rather than leather again just in case it went wrong. At £10 a metre for the vinyl it would not be so bad if I had to chuck it all away. I sprayed the headrests with brown vinyl dye to match. They were previously blue\grey. I don't know how well this is going to last but at the moment they look good.
Any chance of more pics of the bed in action and the access door , interested in doing something similar but wasn't sure about cutting the ply base out! I have r&r brackets bolted to ply !!