Do you have any more info on this car? I have a 41 Super Sport Coupe and this is getting me all twitterpated and Donn Lowe's shop is just down the road from me.......... It's gorgeous!! I have an uncle who wants to give me a Nailhead engine if I want it for the '41.
If you settle for a closed car to start your project I have a convertible frame for a 40's buick (48 I think) its missing the header bow, but everything else is there
The car was built by mightysam (Sam Dams), of Belgium. HAMB'er slapshot posted this picture some years back. There are a few construction shots in another thread HERE: http://www.jalopyjournal.com/forum/threads/41-buick-super-chop.434567/, as well as some pics on Rikster's Archives.