I purchased eight un-cut 20' Weltz metro-shell/amfleet extrusions back in the early nineties in the interest of building a four car Metroliner in two-rail. I corresponded with Mr Weltz then by mail to see if the car ends were available and he indicated they were not, so my pIan then was to get a shorty doaner, remove the ends, fit (sand) correctly/tightly to my extrusion and then use them to create a resin mold with sylastic gel. That was almost 30 years ago. Still have the extrusions and intend to get their windows milled now that I have access to the proper machine tools. I anticipate I'll only get six usable cars out of them if I'm lucky though. The new GGD's that are supposed to be released this year make all this a less compelling project though.