dc, there still exist about 11 Bf108 and 40 or so Nord1002 (french post war bf108 production with Renault engine), not all of them airworthy though.
Here in Germany we have three airworthy Bf108, all depicted on the previous pages in this thread, D-EBFW, D-EBEI and D-ESBH.
D-EBFW is the one we have full access to and is paragon for our depiction.
It carries - with special permission of our aviation buro- the traditional code D-IBFW in large letters on the fuselage and the official registration in small letters on the tail.
There's not a lot readily consumable literature on the Bf108 available.
you can get the period manuals, and there's the odd article here and there in varous aviation magazines and some modeller brochures that deal with the aircraft.
The most comprehensive info in one piece is probably found in MONOGRAM Close-Up #5 from 1979. Having said that, most info we have gathered from the period manuals, from the owners of D-EBFW and from a formar Legion Condor pilot who flew Bf108, Bf109 and He111 during the war and unfortunately passed away just a few weeks ago.