Forgot about the couplers. Maybe you want to talk with the people on the "3 rail scale" forum who do a lot of this type of stuff! I have no doubt that it can be done, but how much of a PITA to do it. If the cars will handle your track, you would only need to change one coupler. If the cars are looooong, they may look silly going around tight radius curves. Maybe you want to talk with MTH.