Just a suggestion, but if you are going to all the work to restore the vehicle then it might be worthwhile to buy the best and most detailed English language work on the subject. I believe the book is fully illustrated and will almost certainly show the markings you are looking for.
KUROWSKI, Franz. The History of the Fallschrim Panzerkorps Hermann Göring. J J Fedorowicz Pub; (September 1995). 504 pages. ISBN : 0921991258. Amazon: new $45.00. [excellent reviews – said to be the best work available on the subject - this is the English translation of the German original].
Then there is:
BENDER, Roger James and George A. Petersen. "Hermann Göring": from Regiment to Fallschirmpanzerkorps. San Jose: R. James Bender Publishing, 1975. ISBN 0-912138-12-2. 208p.
The Bender book is full of OBs covering 1935 to 1943 and for 1945. But nothing for 1944. It also has full color illustrations of all vehicle markings (it was a VERY complex system!), uniforms, ranks, flags, etc. It is also fairly well illustrated, but not a single shot of a Kettenkrad.
Incidently, I trawled through all 7 pages of the link you provided and it was well worth it. What an amazing transformation! You are very, very skilled at what you do, indeed. You must have had to design and machine at least some parts that were rusted through and required replacement. I hope you have it up and running by April. Good luck!