1931 Lima long haul tender help needed..

[Sumpter250]

Both pics show the 21,000 gallon - 24 ton tender behind the subject that I am planning on modeling. She is almost 49 feet long and stands 14 feet high at the coal bunker and 12 feet at the cistern.
Any help with this would be greatly appreciated.

Length and Heights are very close to the 25,000 gallon- 25 ton Lima tender built for the C&O Allegheny.
49' loa, from the face of the bumper to the face of the coupler, 14 feet high at the cistern, and 15 feet 6 inches high at the
coal bunker.
The Lima tender for the "Monogram " NKP Berkshire kit, measures 46 feet long, 12 feet 6 inches high at the cistern, and 14 feet 3 inches high at the coal bunker.
The overall shape, and proportions of both of these, look to be virtually identical to the photos you posted. If you are building your tender from scratch, you would only have to adjust your drawings a bit to compensate for the difference.
The old Monogram, " Snap tite ", NKP Berkshire kit, if you could find one, could supply a reasonably close size plastic tender shell. You would have to build a proper tender frame, as the plastic one has no "depressed center" to the frame.