Try
http://www.sbmcc.co.uk/index.html the site/club only exists for converting vans etc to mobile homes - useful tips re building electrics etc etc. having said that I've had my van for over a year now, and despite having seats and windows etc to put in the back , have done precisely bugger all to it. ( except towbar for trailer and having a profeesional high roof fitted- can't be doing with all this stooping around). One thing to watch - do you ever come anywhere near london - if you do , check out the TFL Low emissions zone pages - could be bad news if your van is 2001or older .