Been a while since I started this set, but I am pleased to say that the final felt has been glued on this morning.
My original suspicions about the cheap Flohr-Botvinnik repros have been confirmed by looking at various chess sets - it appears that there has been a range of designs between the "straight" B-F shapes (not too dissimilar to the repros) to extremely dendriformic "Smyslov" designs, with some sets falling in between the two extremes. Therefore my vision of this set is reasonably aligned with early Soviet shapes.
I sure am looking forward to all the games I'm going to lose with these exceptionally beautiful pieces.
To me the essence of soviet chess design is this one (and what I used for inspiration as my first ever set).
F-B '33 and Smyslov designs are a lot more bizarre and more interesting though.