Fahy's garage in Oranmore, Galway may take it on. I know of an E39 M5 (LHD) that they're currently doing a complete headlight to taillight restoration on (not necessarily a complete nut & bolt resto).

As said, what model E34 is it and what kind of budget do you have in mind ?
In many cases, it may make sense to sell what you have and buy one in an already completed state (M5 in already decent condition being the possible exception).....