The LMS was using corrugated ends on vans from 1924 (D 1663), and later on open wagons of various types. Bulleid would have been familiar with these when he was working on the LNER and SR.
It wouldn't be a big step to consider using corrugated sides as well. Bulleid was also widely travelled in Europe and no doubt obtained inspiration there too.
On these wagons, the triangulated underframe and galvanised corrugated body were neat and efficient designs. On the other hand, the brakes appear remarkably crude, probably only effective as a parking brake. Were any opens built on the vacuum brake fitted underframe like the H vans?
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