A big part of the joy of model railroading is the building of such things, at least for some people.¹ It’s less about the product than the process. That’s a big part of why things like kitbashing and scratch building are popular. Finding a way to construct something out of nothing.
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1. Yes, there are people who are more into the operations side of things, but I think for most model railroaders it’s as much about the building as the running.