The victory condition only determines how far we need to research and is independent of the type of economy we use to get there. I can definitely agree with going for Diplomatic over Space Race if that is the team opinion. Conquest based seems to be the right way.
I still believe that our next great person can and should be an Engineer for the GL. If we go for conquest driven diplo, we will be sure to have a city with enough hammers to pound out the UN quickly, so I'm not sure we need two Engineers.
Cottage economies work great if you plan to have a bunch of very big cities And lots of grassland. We don't have a lot of grassland due to all of the ocean (moscow has space for 7 cottages, Novgorod 6). Cottages take time to mature, whereas specialists work now and produce as much research as a Town before printing press. Cottage economies cause research crashes whenever you expand (which I assume we will do for a backdoor diplo victory), specialist economies only need enough commerce to pay for the city, the specialists do the rest as new city upkeep is paid for by pillaging the other guys cottages and replacing them with farms.... Cottage economies play very well to financial, which we are not. We are philosophical, so a specialist economy plays to our traits (more great people).
The best use of great scientists in a specialist economy is an academy and then settling the remaining scientists in one city. That city gets GL, all science buildings, Oxford, and a research facility if we get as far as computers. The settled scientists produce more great people points (positive feedback loop) and produce 9 beakers each with no food consumption.
The specialist economy often loses steam in between Liberalism and Biology, this is due to lightbulbing too many techs instead of settling the scientist and having a massive science/great person generator. GSs are often used for Astronomy or Physics, but we can probably do whatever conquesting we require with galleys due to the Archipelago map so lightbulbing Astronomy is probably not key.
If we were financial, not philosophical, and without the pyramids, I would definitely agree with cottage vs specialist. However, we are not financial and we are philosophical and we have the Pyramids. This screams specialist economy to me. We will have wasted the hammers that could have been used for settlers and galleys to produce the Pyramids if we don't run specialists.
I brought all of this economy stuff up now as the choice of cottages on the Floodplains in Moscow seem wrong to me. 1 farmed FP means 1 extra specialist.
However, if the consensus is cottages now, then we need to be thinking about our GP Farm to leverage our Philosophical trait.