I haven't. However, I have put all my Model A running gear (brake mechanicals included) into a Model TT frame, which is MUCH narrower (and parallel) . See the link in my signature for build pics.
Where's the insane part? ... I could be wrong but I think the early Indy cars used narrowed car frames. I am pretty sure I saw one that used a 32 Stude frame narrowed a lot.
This is true, lots of early Chevy frames were modified too. There are some good pictures in the 1844-1944 racing thread.