Got the seat swivel from this place on ebay but I think there’s a few options now:
http://www.ebay.co.uk/usr/customshop_designs_uk
Real easy to fit with the bulkhead out, unbolt the seats, tip them back, slot in the swivel plate then bolt back up.
DVLA accepted mine as a camper with a camp stove and a unit built around it, can still lift out easily enough.
Recently added two ten watt spotlights for external light at races.
Best thing about the beds was the main bed was sized for under bed boxes which all slot straight in, keeps it organised, then up to 4 bikes can slot in under the top bed. It’s tight on the top bed but does. Take the top bed out and you can fit in a camp bed.