I was counting on a five turn SoL with overflow as we have 263 hammers. but then I'm not certain how overflow works. At some point overflow turns into gold, but when? But I will build a buddhist missionary for culture buildings in Gergovia/Orleans that should give massive overflow.
I think massproducing settlers make sense. they pay for themself very fast.
But priority is factories and corps.
Overflow turns into gold if the number of OF hammers is more than the hammers needed to get the actual build.
Eg. 31 hammers put into a Warrior without multipliers will make a warrior, 15 OF and 1 gold. Thus building a Missionary is a bad idea. I would try an aqueduct/hospital instead. (Sorry, I can't calculate it now, I have closed the game and I have to go)
Also note that we get a 4,75 multiplier on SoL in Thebes: 100% from IronWorks, 50% from Forge+Factory, 50% from Power, 100% from Stone, 25% from OrgRel and 50% from being Industrious. That gives us more than 300 hammers if we work production tiles. (some starving is okay. Build the Aqueduct/Hospital and it won't be very bad.)
Overflow is capped at max(city production, build cost). The wrinkle is in what counts as city production - chops, etc don't count so you simply get the hammers produced by tiles, specialists, corporations and buildings.I think that SoL is a good thing to aim for now. We don't really have any economic techs around that would help us anymore. It doesn't hurt the corp plans at all. But it will give us 324 BPT, and will get us to Future tech 1 faster. Also less starving with 1 more specialist.
As for trading it around, I think that it doesn't matter. Hammu might get it sooner than 2 turns, and we are not giving it to SB anyway.
@ZPV: How does it work then? I must have remember something wrong, it was ages ago when I last read about this.