Hi Duane,
I've got an E-M under construction in Sunnyvale. If your friend would like to look at one up close let me know. As far as the rear width goes, I got alot of help from E-M with converting my frame from leaf spring to Jag IRS. I don't see any reason why you could not narrow the rear to any width that you want, and then just move the upper shock mounts to match. My car is also set up with radius rods rather than trailing arms so frame mount location was not an issue. Working around the frame rails might be a bit of a problem, but nothing a little cutting and welding can't overcome.......
(It's about 34" outside to outside)
-Jon