Not sure if this is any help, but you can make the c5 shorter by removing the boot. I had to do this to squeeze a c5 into the back of a Ford Sierra hatchback.
When I delivered a C5 to Tom in Tipton, we managed to squeeze the c5 into his conservatory by turning it on its side and carrying it in
. That was quite a narrow door.
Mine live in a 20 x 10 garage, alongside the mini-el, so not too much of a problem