Nice job with the Thomas B&M one. Bob, I like that Lobaugh, although its dimensions look a little too husky for me. Those last photos show the size difference between early and late 4-4-0s - amazing! And those new Lionels look beautiful.
I also saw once how somebody cut down a Rivarossi 4-6-0 into a 4-4-0, and I think those drivers are the right size. That could be an inexpensive way to get started.
I wish I could post a prototype photo, but I don't want to run afoul of any forum rules. We're talking the kind of stock 4-4-0 that all the railroads had in the 1880s.