Sometime back my other half obtained via e-bay (Cheap) a Lionel Christmas bogie wagon, trucks where both broken so replaced then with L.G.B. looks and works O>K! I know this is an expensive route if you have several vehicles to do, but if it is a special or one off, it's worth bearing in mind!
Quick question for Mr Spock are the metal wheels sets you are using Accucraft ? I like the way you have turn then into disc wheelsets.