Hi I'm wondering if its possible to put au door trims to xh and if so how many mods am I looking at? Any input muchly appreciated cheers.

The amount of work you would have to do to fit them would basically make them complete custom door trims.
Mind you there is absolutely nothing wrong with that.
You could use bits of AU door trim and blend them in with a replacement backing board for an XH.

What kind of mods would be involved? Or would it just be a pain to do?

It has been done on an E series sedan before, but that might have been B into E series though. I'm on my phone ATM so I can't post a link for you. But I'm sure if you do a search for AU or BA door trims onto E series it should show up.
Just from memory it was a pretty involved process, removing inner door skins and transplanting them to the E series door. Much fine welding... But if done right it would look awesome in an XH.

Alright thanks mate, can suggest any other options for door trims? I have home made ones at the moment but they're just getting too damaged so time for new ones.