UPDATE November 22, 2014: Here is today update from Peter van U. in The Netherlands, who is
building his own Baur. See the earlier posts (below*) to learn how he has accomplished this so far.
Basically, he has cut the Baur roof off of a rusty Baur, and is installing it on another E21 coupe.
"Today's work make the right backfender ready, weld a new under piece in to it"
Great work, Peter!
*Here are some earlier posts on Peter's project: