Great idea! Our team (CSTO - scenarios Polish-Soviet War 1920 & Poland 1939) thought about creating something similar but we decided to quit it (temporaly ). We are perfectionist and were afraid of missing some data (eg. Romanian OOB 1938 - there was a military treaty in case of Soviet attack - 21 infantry divisions 2 cavalry both sides - which Romanian? Nobody knows...
Polish & Czechoslovakian OOB researched quite well - if You need help - just drop a line...
I know you guys and I was playing your scenarios since 2000s (aside of stuff like Polish-Soviet 1920 and Fall Weiss there are also notable solo projects like Piotrkow by Bartek etc). Actually, your works were always among the "top-25 TOAW scenarios of all times" kind for me.
I'm yet in the process of collecting data in my free time. FYI I do have "Kresy w Czerwieni" by Czeslaw Grzelak which is, to my knowledge, is the most comprehensive study (from the Polish perspective) on the potential - and actual - Soviet-Polish confrontation in 38-39. Also I'm currently cooperating with a research colleague of mine, who works in Russian RGVA and TsAMO archives, trying to get as much statistical (numbers, locations and OoB) data about RKKA specifically in 1938 as possible.
As you could imagine, the tension, mobilisation and buildup (deployment) of troops (closely connected with the general strategy of opponents) would play a major role in a conflict like this (with Poland, Romania, Baltic states, Finland and Germany potentially involved, and so with as many as 5 potential theaters), so I'm keen about depicting the strategical level from opposing General Staffs' perspective, with all the things included like few turns of pre-war period with a lot of political and strategical Theater Options, with mobilizing and rail-transporting your troops, building up your theaters depending of your general strategy etc.
As a final note, I think that I might be actually aware of your efforts made some time ago in this direction. A friend of mine - Kiev historian Eugen Pinak - told me about a group of Polish TOAW developers and milhist fans that were developing this kind of scenario, without mentioning CSTO specifically, but I'm 99% sure that were you guys. And I think it would really make sense to start cooperating at some point (when I'll have enough research and preliminary work done to share something). Especially that we seem to get TOAW4 (fingers crossed) at some point, so the work and time won't be wasted and hopefully could be migrated to the new platform.
"Russia has only two allies: Russian Army and Russian Navy".
---Emperor Alexander III