Ok, here are my thoughts so far.
Trades
Renegotiate the Ivory deal with Pascal for more gold (hopefully 13gpt instead of 4

).
Trade our 3rd Ivory to Surry for 11gpt
OB with Surry
Techs
Finish off construction, then HBR. If I get the second Scientist in Tiwa we can get another Scientist quite quickly, so hopefully we will still be able to get some trades (Civil and MC at least, maybe calendar too if we are lucky) from a Philo bulb.
On the other hand, I'm wondering if maybe we should go for Feudalism for Vassalage. We don't want to change out of OR to Theo because of it's diplo benefits. I'm thinking we could stack builds of units until we get it and then have a bunch of units show up with 5xp instead of 3. That would also mean we could avoid building stables to boost our elephants to 5xp. The disadvantage of this is not getting Civil Service which we want for irrigation spread and movement towards education for Oxford.
Builds
Olly must be swapped to the HE, we need the extra hammers that will provide.
Cuzco will build a settler rather than a sword, Pascal will be burning down the barb city next turn, I'm not sure why we didn't get units up there sooner
Units
Because we will have elephants in our stack we shouldn't need spears for stack defense, but we will want so have some to defend cities.
We should designate two cities to have stables, I'm thinking Cuzco and the HE that will build phants, and the rest will build catapults, axes and archers.
Hatty as maces and LBs, so we will want a heck of a lot of catapults to bombard the city down to 0% in one turn and still have cats left over to cause collateral (15 maybe?).