The photo attached is from the P002 I drove in Firle Place a couple of weeks ago, its the station wagon version, rather than the belstaff version. The drive was fabulous and grinned ear to ear throughout, especially the drive through the pond and the dash up the gallop
On the Belstaff version the panel on the floor just to the rear of the seat mount is not there, ie the whole seat is moved 88mm towards the rear, this was born out by the floor fixings where the seat pad attaches to the floor in the 2nd set of doors, there are 2 fixing points .
The rear leg room in the SW is quite tight and as previously mentioned the seats upright, but ok for children and compact adults, I would guess anyone over 5' 92 would find it uncomfortable.
I would guess, that the whole bench can be moved back into the same position as the belstaff editions with a good mechanic, torex fixings throughout , all the fixing mounts seem to be there and the only thing [i think] which would need changing would be the trim cover where the upright seat engages the top bow fixing. giving more leg room, but in the UK this may mean its not a commercial any more but it would take a very astute person to pick that up!
The practicality of doing this should be discoverable when we get access tot he technical manual and drawings once received the Grenadier.
Kind regards Garry