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Everything should been thinkable. A forum lives from new ideas! So I am absolutly not against any discussion of these wars. I doubt only that their is an market for this theme. There were only 6 participants in the first thread about this theme which doesn´t give me the impression that there are really an overwhelming broad interest in it. I am also interested in events which are nearly forgotten in the public like the Chouans Wars or the first Coalition Wars during the French Revolution, the Hussite Wars or the Russian-Polish War of 1920, which were important events too. Eventually wars of still more relevance than yours wars, but also mostly not so attractive to produce special miniatures. Strelets is a small precious company in a special situation, in a country of war which have to look to survive with a sucessful strategy of production. And eventually 30 collectors which are interesting in the Chaco Wars doesn´t make already a market. And like in your first thread mentioned in the forum, there are many possiblities to alternate existing miniatures to get yours requesting armies. And we have an special situation too, that Zvezda is disappearing the market of affordable figures, that Revell and Italeri have already left the theme of historicals. So we need Strelets still more to fill the many existing lacks in the production of broader known periods.
It's interesting how you mention that folks outside of South America wouldn't really know about this conflict Blucher. I'm American, but my wife is Bolivian, so it was only through her that I discovered the Chaco War, which unfortunately went very badly for Bolivia (as have most of their wars). You're right, there's probably not a huge market for this, but if Strelets were to do some limited edition sets I would certainly pick them up.
Would also like to see the MK5 . As to it not being viable commercially strelets has covered some pretty obscure conflicts already . The Russo Turkish war with I think 12 sets springs to mind .2 sets for the Chaco war seems doable especially as they will be the only ones in the marketplace
The South American wars of independence might also be interesting. Would love a set of Bolivian line infantry in red! I don't think we'll ever see them, though as many other sets from similar time periods can be pressed into service here.
this article gives some background info and may be useful as an overview for arms, the Vickers Archive also has a number of photos of guns intended for this conflict...