I reckon its brilliant too, the good thing for perspective cab builders is that they could scale this up to make real cabs I guess, with the dimentions of the originals.
I was going to make a Defender like yours but cant get access to the site at the moment
The practical thing about this, is that if you had access to one of those real big CAD/mapping printers you could make a scale version as an outline template for cutting the particle board for a real replica cab- now that would be cool