Thought I'd give an update of where my core is now, after ~6 battles, in Finland 1/1940.
T-35 company is now KV-1's (a little early for a full company, but I had to replace 7 tanks after one battle with the Finns
and I planned to upgrade anyhow.)
1 platoon of BT-7's replacing my BA-10's, the snow left them essentially roadbound, and one platoon of T-18m's to support my grunt company. I really like the T-18s as support, but they are sooo slow. They work fine as long as the troops are walking, but they can't keep up with any motorized transport. I might replace them with BT-7As, the 76mm version, for close support, or make two mixed platoons with my existing BT7's.
Still have the Marine company, and one regular leg company with DsHK's, and the rest of my attachments have remained the same.
I'm contemplating upgrading the 122's to 152's for the extra range. I'd like to be able to counter-battery as much as possible.