OK it looks like I've found the bus
A Nissan Civillian. Seems to be mechanically sound with most of the features I was looking for.
The batteries and spare wheel will be moved to make room for my motorbike and then
I intend to add solar and change house lighting to LED. Air-Cond. may come later.
Looks like I'll be busy for a little while. I'll post more as I go on with the work.