I just did my version of an fef2 on the let's see your fef3 thread. I carved off the feed water heater in front of the stack and associated piping. I steel need to modify the pilot as the fef2s didn't get the master mechanic pilot like the 3s had. also there are some changes that need to be done to the tender deck on the oil tank that I left off for the ease of the project. im more of a Santa fe modeler but I have to have these for Cajon pass abd I don't know every little detail like I do Santa fe steam. maybe Jason, bob, richie, or someone else witheven more knowledge can help. also Bob did write a very good response in a thread on here when these were announced. look I'm the product discussion forum.