Fitting the wood floor
I have used engineered floor panels for the flooring. This is probably a bit overkill and heavy but it looks nice and is hard wearing. I think next time I would have probably only covered just the walking area and not under the sofa as well. I think the photos speak for themselves here but you start by making the floor even with plywood sheets, then lay the flooring on top and gluing it lightly with floor adhesive. Under the flooring is also a lightweight layer of insulation - its a mat which has some sound proofing properties and also insulation to stop the cold from coming up into the van.
Next is the rear of the van and this was a case of simply getting some vinyl cut and sticking it down!