Hi John, welcome, an other U1000 owner here.
Some external panels are available, I`ve not seen internal panels for sale, but not to hard to fabricate replacements your self.
A couple of the well know uk dealers or ebay.de a good place to start looking.
Hi John, Welcome aboard
I have also got a U1000 that came from Modie-Bond (RIP
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I live Nr Stroud also so not a million miles away! Which part of Wiltshire are you in?
Its good to see more land Rover owners especially ones with a lamping light on it (Note to Villager, we need a shooting area of the forum 
I hope your cab has less rust than mine did, it was a few weeks of cutting and welding to get it solid.
Does your Mog have a pick up hitch, If so may I have a picture of it as I am missing a piece and want to copy one?
Being in Wiltshire means you are close to Ken Day, If you need any help he is one of the best Unimog guys I know.
Tony
What type of hitch do you need a picture of? I`ve got a ARM(I think), type, a PUH hook, and clevis above, similar to the type fitted to deutz tractors of a similar age.