Again, thanks for all the advice. I have been tinkering with the kits for the last couple of days. Here is a question concerning ouplers: I built a Walthers tank car and the cover that holds the coupler in place just snaps on. Is this good enough? Or does it need to be drilled and tapped for a screw? I feel I have the physical skills to build these things, but not sure of the exact techniques or the best way to go about doing things. I suppose some experimentation is the way to learn? I also found the NMRA site and it has some good info. Thanks!