MilesB, my first ambo also has redundant central locking units, I was told they were linked to the ambo body doors.
Mine already had the second alternator removed.
Beware when rejoining the chassis, some people just run a strap on the top and bottom of the rails. Having done numerous chassis joints that will pass any state regulations. A really good welder is needed who does this type of work!
I've still got the second alt but it was just charging the second battery which never seemed to be connected. The one it was starting off was basically dead when I got it. I swapped and it struggled to start with the second. Hopefully that battery is ok. I'm buying a new one and wiring it to run off two batteries all the time. Not sure what I'll do with the second alternator. I pulled the starter and cleaned all the carbon and filth out of it. The commutator was basically solid carbon. New 2awg wires from each battery to the starter. Hopefully I can sort out the mess that's been made of the ambo fuse block area soon. It's got a bunch of garbage wiring between it and the Chevy relay/fuse block. I need to strip all the tape out and work out what's original. The light harness is obviously still mixed with the ambo stuff for the flashers. Should be able to pull that out.
Front suspension was unroadworthy. I pulled the arms and replaced the bushings and ball joints but am waiting on a bigger spring compressor to get them back in. They don't kick in like car springs. Someone slightly bent the arms the last time they did the bushings. They were a pain to get back into the frame. I reckon they pressed them across both sides without support because the arms are too big to fit in a normal press.
I plan on doing the frame the same way the ambo people did it. They obviously used an engineer and did plenty of them so that's good enough for me. I had planned on fish plating the entire height of the vertical web, but they didn't do that so I won't.
I've got a K3500 ECLB DRW that I was planning to convert to RHD. I ended up wanting a regular cab and haven't got the time for the conversion. When I do the frame shortening, I'll use the bed and dually rear. In the long run I'll shorten the K frame and swap to it. It's a 454. I prefer gas motors to the 6.5. I imagine I'll use most of its harness too because it's pristine.