IMHO, Doug -
You need to drop those beams a tad - at least in the center - to lower the boiler
enough to avoid sheering off the domes and the top of the cab when you get to
Toltec Tunnels #1 and #2
...
Have you considered a shorter design using a K-37 boiler suspended between the running gear of two T-12's - a C&TS 4-6+6-4 "Challenger"? Maybe you could borrow #168's & #169's frames, etc., for a year or two while they're undergoing restoration to prove the concept, and then build the final version with one-piece engine bed & cylinder castings, Franklin rotary-cam poppet valves, and so forth.
- Sincerely,
Willie (Wm. Claude Johnson-Barr III, Esq.)
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