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Pa, your foto shows really some similarities with the parts, but I hope, that it isn´t this kind of a Tachanka.
I have studied in the internet many photos of Tachankas, which were really different, but never before like this german captured Tachanka in your foto.
The first thing that pops to mind when looking at the pictures is field kitchen, Russian, WWI... although the cap on the fellow on the right looks like something prior WWI. Actually those two could fit into any scenario from Napoleonic till WW2.
I also don't think it's a tachenka, but I do hope you make one! i love the sculps and those figures look like they're having a great time. Can't wait to see the finished product.