Preturn: I plant a spy on Mongols as we need to know where it goes and it succeeds. It's built one part and another one in progress.
I get Ecology+2353g+WM+Amphibious War+oil+75gpt from Mongols by Satellites+Superconductor.
I cancel MA with Mongols and get back 21gpt. Sumeria and Russia are up Synthetic Fibers.
We fail to immediately steal from Sumeria.
IBT Portugal and Mongols make peace. Mongols build second part.
(1)1655AD: There is some deal that we pay 25gpt to Russia for nothing so I cancel it.
IBT Mongols build third part.
(2)1660AD: Miniaturization shows up. Another SS completed which I forgot to mention.
(3)1665AD: We try another immediate steal and it succeeds. We take Synthetic Fibers instead of Miniaturization as we can build another part.
Russia took another city from Mongols. TOW is just not up to the job when facing MAs.
I renew lux deal with Russia and get 174g.
IBT SS Engine completed. Sumeria adds SS Docking.
(4)1670AD: nothing happens.
IBT Portugal requests peace. Although I see no reason for a war, I am not sure if we still have war happiness, so I decline. We build SS Storage/Supply and SS Thursters.
(5)1680AD: I make peace with Sumeria and get 2510g by paying 145gpt.
I buy Uranium by dyes+124gpt - yes, it's that expensive. Also buy Rubber for 231gpt - more expensive. We have 5590g so it's enough for 3 immediate steals and there are only 1 tech to steal..hope we'll fail?
Immediate switch to SS Exterior Casing and SS Fuel Cells.
I then try an immediate steal and it succeeds! We take Miniaturization, but we are still in peace.

Oh well, hope Sumeria comes up with new techs soon.
And I start Modern Armor everywhere.
I also get coal by 36gpt. We need to finish the railroad..
We are only making +43gpt now.
IBT Mongols don't want RoP so I pass. Sumeria builds SS Thrusters and SS Life Support System.
(6)1685AD: disband outdated units such as legions or MDI.
IBT build SS Fuel Cells. So does Sumeria.
(7)1690AD: I sell Synthetic Fibers to Mongols for incense+WM+524g. I don't think it is going to be a threat.
(8)1695AD: Sumeria has Nuclear Power. I try an immediate steal and it succeeds again!
(9)1700AD: Russia gets Laser.
Somehow one turn is lost so I stop here.
We have two more techs to go, and Sumeria is 4/4. Russia has no progress. Mongol is still two techs behind us and has no rubber.
We have 2600g with +75gpt. Sumeria might be doing 4-turn research, so let's just hope it does the right thing.
I think we should only do immediate steals. We just barely have enough gold for two immediate steals. The worst is that we fail our steal but get uncaught, that would mean we'd have to wait for our deals to run out before we can gather enough money again, which almost means loss. So I think if there is any chance, let Sumeria declare on us (e.g., fail steal, demand leave, refuse tribute demand, etc). Then we can steal two techs, and make peace again with it to finish up our last part. So if we go to war again, no more MA. The next 10 turns will be very interesting. If we go to war, we need to be able to make peace with Sumeria before it completes its parts.
Remember:
Laser: SS Planetary Party Lounge: cost 160, only requires Aluminum.
Robotics: SS Statis Chamber: cost 320, requires Aluminum+Uranium.
No more rubber needed.
We are currently building SS Exterior Casing. Do not switch it.
I also put lots of outdated units in Turentum to avoid flips. We can't lose Aluminum.
EDIT: I just read what Bugsy said about signing one more MA before making peace..and I agree that is a better strategy (although MA is probably not needed). I might have done something stupid.

Sorry. Now indeed Sumeria is building parts crazily. I was thinking in a different way and somehow I thought you guys were talking about Russia in mobolization, not Sumeria. We can still win this way, but if the team desires I can also replay my turns.