I agree with most of that Tam, and I took out pretty much all the ambulance electrical system and then rewired using a lot of their kit but not via the circuit boards and relays in the control box. A lot of the switching was done via relays so to power a few led lights the relays were using more electric than the led's. I also removed the inner skin/ floor as the steelwork behind it must have weighed in at half a ton. I knew all this before I got another one. Learnt the hard way. lol. Any water ingress roof side will also soak the insulation, but not show up in the hab area as nicely fibreglass (don't go there) sealed skin. So any water runs down inside the skin and rots the inner sills out. If you can remedy, they're still a very good van / size/ reliable.