So I finally got round to finishing the floor after I had lined the van out, using the original caravelle floor that came with the rails I made cardboard templates both sides of the wheel arches then made thin ply templates and screwed to the top of the floor, took the floor back out then cut the four sections out made up some new pieces with 9mm ply fitted to the floor and put back in retrimmed with new carpet thanks to @slidepods for giving me suppliers details for this job done!