Don't use the class 25 and 35 drawings from the Gazette that are listed. Use David Fletcher's drawings of the two versions of the class 35 2-6-0s as they are drawn from the original drawings.
If you want the original drawings for accuracy, here is a list
Cl. 35 early, Baldwin 12D drawing 1 separate elev & sections, Smithsonian
Cl. 35 2 steam dome, Bald 12D dwy 3 separate elev & sect, DeGolyer Lib.
Cl. 40 2-6-0, "Engineering" magazine January 12, 1877, Linda Hall Library has bound copy
Cl. 42 1/2 separate elev & sect, Smithsonian
Cl. 45 1/2 separate elev & sect, Smithsonian
Cl. 45 erect.card 627, possibly PA State Archives
Cl. 56 #34, Cl.60 #42, and K-28 drawings saved by the late Wayne Lincoln and are now at Denver Public Lib or CRM.
Denver Public Library has about 200 C-16 drawings and about 200 K-27 drawings.
C-17 erect. card 1317, Bald 10-26E, dwy 10, possibly PA State Archives
C-18(F&CC) erect. card 4747, Bald 10-26E, dwy 18, DeGolyer & PA St. Arch.
SN #3&4-same drawing, but erect. card 5438
C-21(CF&I #101, 102) erect. card 2653, DeGolyer
C-25(Cyrstal River #103) erect. card 4399, DeGolyer
Dave