After seeing the remarkable job you did with the wheels on your scratchbuilt caboose, I have a question for you. I guess this actually pertains to anyone else, too. As you can see in the picture below, I have a Lionel 4-axle crane and a cheapie flatcar. The crane is neat, but is more suited to being a display model, as it is quite heavy, and tends to yank trailing cars off the track. I'd like to bash the flatcar into a crane boom car (?), and replace the wheelsets on both cars. Is this possible? Do you have reccommendations as to what types of trucks, couplers and wheelsets to use? Thanks!