General plan for the next 10 turn.
1) Eat 2metra's west. You know, the part to our north that
should have been ours all along but I failed to block 2metra off until he's established his claim. I can probably take and keep 5 more cities in as many turns with minimal losses.
2) Offer peace to 2metra for "I declare war on Bigger" and throw in anything I can to sweeten the deal without giving away cities. I'll have gobs of machine guns and infantry crawling all over up there so I should be able to back up my claim to the territory.
3) get OB from 2metra for a nice price. Probably offer 30gpt + "I declare war on Bigger" so that 2metra accepts. Time is critical and I don't care about the economy, so I'll just pay a premium rather than risk denial of the initial offer and haggle.
4) Accumulate as many troops as I can into one MEGA STACK and go invade Bigger from the ice, aiming at his capitol and wonder-whore city. March through his core 1 tile at a time, eating everything in my path ... or die in the attempt. Either way this would be the last march of the game. I'll either establish my claim as dominant power, or get wiped out and concede the game to Bigger. Why? Because Bigger will have Tanks in 20 turn, and then my army will be irrelevant. I've been drafting and upgrading like crazy, and my stack now is up to 50 Infantry, 20 Cannon, 30 Machine Guns, SuperMedic, 15 Cavalry (this leaves 30 infantry and 10 cannon on zone defense in the west along my main Bigger border). I'll have about 10 more turns of unit builds that can reach the front lines and join the MEGA STACK in time. I'll prioritize builds as Cannon and Machine Guns drafting another 20 Infantry. I estimate final numbers around 70 Infantry, 50 Cannon, 30 Machine Guns, and any other junk I can scrounge together.
The goal will be to raze everything of Bigger's core, marching until either Bigger is wiped off the map or my stack is killed. I'll be practically immune (I hope) with 30 machine guns that won't take Collateral, and 80 units total that soak collateral. I won't keep anything, just pillage and burn and scorch the earth.
Picture Dump:
Bigger being annoying and pillaging

don't stir up trouble Mr. All-I-need-to-win-is-to-be-left-alone-and-tech-to-victory.
Bigger's army on our east. I think he has a bunch of Rifles down near AT's former lands and has his greedy eyes turned towards lifting that off me. I have to take some risk though, and I'll probably let AT's lands get captured so that I can put everything into that one MEGA stack.
My current forces.
Bigger running away with the game. This is why it's either put everything in a giant stack and die now ... or wait 2 months and die later or concede. I'd rather go down fighting now in a hail machine gun and infantry bullets.
Projected spoils from the 2metra war. I get everything West of Hoth, occupying Hoth with all my machine guns and pillaging the hill to Hoth's north to prevent his army from railroading through. That makes a nice military choke point
The "War to End all Wars" ... The Million-Mile March.