Now I have seen your setup in action, I have really warmed to your idea as a workable solution for me.
Thank you for making this video and sharing it with us. It's much appreciated.
im sure you have seen mine van on video? mines a diy set up too. lee burbidge did a video of it, but it has changed since then with the addition with the hot water system!
this is a link to the un-finished fitting of the heater
http://youtu.be/AM07hsbkChU