I have the talent to make that end look like the real thing, but I would rathr work on steam models. When this powerful locomotive is hauling a string of cars around the test loop, I do not notice the flaws in the pilot.
On the other hand, that Kadee mount is carefully machined from brass to completely fill the giant hole originally designed for lobster claw couplers. These plastic models can be taken to any degree of realism an owner could want with minimum effort.
The MTH trucks that are redesigned for drop-in wheelsets are a great idea - just make sure your favorite Diesel or subway car has those truck blocks, and not the older ones. The replacement of wheelsets on the original axles is not trivial. It requires special pullers. Drop-in is the way to go.