Messing around with the Gondola ends.
I kept the horn hooks, but cut off the excess to make them into sorta knuckle couplers.
All this really needs is some vertical side braces and will pass for a narrow gauge gondola in whatever scale. On30, 35N2, or 55n3.
There really was no designing involved, it's just covering up what looks like a TYCO HO scale gondola. I even left the rivets visible on the inside; perhaps this is a steel plate lined wood car?