Given what Kleemann charges I'd rather fiddle w/ an Eaton, but besides that I think rear mount would work nicely on a 119.. I know some people in Japan have done front mount turbos, a-la:
http://picasaweb.google.com/AMGEast/560TwinTurbo#5254904720452060802
I know it says 560, but you'll clearly see it's 124/119.
I've seen numerous video's and read a few articles on the STS turbo's..and for low (5-8 lbs) applications they really appear to work quite well. The Trick is to spec the piping out properly as to keep velocity up going back to the turbo..
Also, I'd think one could do a Very nice/trick twin turbo mount where you could just barely see the compressor wheels in front of the rear bumper making for quite the image for who ever you pass in the evening;-)
Jonathan