Tim O'Connor wrote:
"Thanks. 11 unevenly spaced stake pockets... hmmm doesn't the old
Athearn 40 foot flat have 11 (evenly spaced) stake pockets?"

Yes.


"Does the spacing of the Red Caboose pockets match this N&W flat?"

No. Additionally, the Red Caboose flat has 12 stake pockets.
http://www.red-caboose.com/Product_Photos/Details/ho_flat_side.jpg


Ben Hom