Apparently, unless Carey does it you won't get videos. My test loop is down, and I have never really tried to post Youtube stuff. But just to keep this thread on life support, here is the Lobaugh/scratch NP Challenger:
This one has my should-have-been- patented twin spool design, inspired by the triple spool Rolls Royce engines I was flying at the time. Front driveshaft goes through the middle of the rear driveshaft, with two Pittman motors in that giant firebox. The Achilles heel of the setup was the Delrin chain step-downs - they were noisy and inefficient. The cure will be the tooth belt - some day.
This differs from the Fetters challenger only superficially, so Lobaugh used many of the same components. As I recall, the sand domes are genuine, but the firebox, cab, rear truck, and valve gear had to be made here. The tender drawings I have show a shortened tender, so mine is a wood block, full length, from Cyclopedia drawings.
I have never seen an actual Lobaugh version of this model, but a nice guy on the East Coast - same name as a famous drummer - sent me photos. Any of these things are now 80+ years old, and unless restored are pretty well beat-up.
But yeah - would love to see more from Carey or any of the rest of you. Even an MTH or Lionel version would be welcome, I am sure. They are now better scale models than these old things. Third Rail did really, really nice Challengers! At least hit us with photos?