Anything can be done I guess, but I would not advise trying to get access to the shower valve and lines through the tail light assembly. There would be very little room to work on it, and you would have a big hole in the inner wall which would be a perfect leak source.
Your Caravelle is a pretty rare model and I doubt that you will find much experience with it, unless you are lucky. Is it possible to just leave the original copper in place behind the shower? That is what I did on two Argosy's I have re plumbed. Even with the shower fitting close to the edge of the toilet on those rigs, it was hard to get at the plumbing for replacement, so I left small pieces of the original there.
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