Problem is that the plain vanilla 57xx/8750/97xx/67xx//riveting pannier is in need of a facelift. Correct tank filler, correct cab doors, lack of top feed or presence of, correct brake shoes, 3D tank stools, roof grab rails only when necessary etc. While required in masses for ant GWR layout post 1938 or so, not very cute and therefore not currently commercially viable in 4mm - very bizarre.
How much does a commission actually cost.
Oakhill