welcome, there are other much more knowledgable folk on here, especially Errol, see his website Engenia's Benelli Tornado Novocentro Tre
This is principally about the tornado but most of the mechanicals are the same/similar.
From my limited knowledge, locksets etc are all std stuff, bodywork try ebay italy.
cam chain sounds due a change but relatively easy as its on the side of the block. No sprockets need changing but spring and movement of the tensioner should be checked.
The z25 gear was a weakspot , with an upgraded set with proper tolerance available.
Good chance the rear shock will be shot if mine is anything to go by.....
Good luck and post some pics