I don't know how late Doug's Sterly is, but if it's a particularly late gun, that can explain a lot of things--like Savage using up the wood it had, as they were halting the production of "real" Foxes. I had a unique, very late SW 16. The gun had a receiver the likes of which I doubt anyone has ever seen on a SW, unless they saw my gun or photos of it. Instead of the raised "bosses" on the sides, it had the typical SW engraving that followed the contours of the bosses--but the bosses themselves were absent! Flat-sided gun. The explanation is that it was likely an SP receiver finished as a Sterlingworth, at the very end of Fox production.
When it comes to wood, I think we've seen the same thing on other American guns: Late Field Grades bearing wood that looks like it belongs on graded guns. Again, a case of the factory using up what they had, as production wound down.
No way to know whether that's the case here, but it would appear to me that's one possible explanation.
