Hi Glenfinnan....am just replying because I don't want you to feel neglected. Sorry...I have absolutely no idea what an Alphard camper conversion is! I am guessing by the lack of responses that nobody else does either? Maybe you could enquire on a different site? Enjoy ....anyway...whatever it is
I suspected this was a form camper van and a quick Gogle confirmed it. I'll admit I'd never heard of the make. It's the same principle as a Dormobile for others who are in the dark ☺ I have always fancied such a vehicle. Happy camping if you do decied to buy.