Question is….do I buy more packs for shits and giggles, or do I consign them to dusty shelf? I have probably missed something.
Those conversions look great, but will be costly! I have mixed feelings about WWII Soviet Cavalry. On the one hand, it's surprising that almost no one makes Soviet cavalry, considering that you can readily find cavalry for the Poles, Germans, French, Italians, British, when the actual Red Army had more cavalry than everyone else in the world combined! On the other hand, cavalry in WWII is really mounted infantry, and the soldiers would dismount to fight. Horses can be treated much as you'd treat trucks or other transport. So, depending on your preferences, you could have a few cavalry models to represent the ability of the troopers to move quickly when out of contact with the enemy, much like some games will have a few bicycles to represent bicycle troops.
If you do feel a need to go full cavalry - which I selfishly would love to see! - plastics would be a great way to go. Combine plastic Soviet infantry with Wargames Atlantic horses and go from there.
To show you where my loyalties lie, here is the start of my WWI Russian cavalry wing:
https://willstoysoldiers.blogspot.com/2024/08/wwi-russians.html