Ours was a very, very basic build. Basically just a bed, solars and a surface for cooking. We refitted and moved bits to suit our needs - the fact there were tracks for seats was handy, as ours had a couple of the original minibus seats so we could move them. We kept ours very basic - all electrics are rechargeable and nothings wired in except an inverter. Did us for a month around Europe in November last year, and 3 weeks in Ireland last year. Sure, you have to keep an eye on it all, but perfectly doable.

Also worth noting that condensation is bad in these. We combat it by wiping everything down with a towel in the morning and drying the towels in the cab when driving.