Bryan,
How much material are you removing to clear the wheels? What is left for a bolster pin?
I totally removed all traces of the bolsters from the bottom of the casting, and drilled/tapped two #00-90 holes through the frame where the new "bolsters" would go. I then removed the posts of the two bolster pins, drilled through the center from the top and inserted #00-90 screws to secure the trucks to the frame. The 28" wheels pretty much insure the flanges won't touch the frame due to the humped bolster cross beam of the MTL trucks. The end decks are scratchbuilt from styrene over the diecast frame to match the prototype. The only original olastic body parts remaining on the New Haven model are the stirrups. On the Penn Central (ex-NYC) car, the remaining original plastic parts are the stirrups, pole pockets and jack plates.
The magazine article had a step-by-step construction, but these links give the summary:
http://www.bbussey.net/ns/fNH17082.htmhttp://www.bbussey.net/ns/fPC766059.htm