Alright, no screens have been posted in a number of turns but here is what I have from the latest screens:
Our "base" GDP is 290. Or "base" production is 48. I'm guessing we've grown a bit by then. On the other hand, we were running 100% research and a deficit, so I have no idea what our "actual" base gold/research is.
I'm going to guess at breakeven, we are running 190 research. That's just a guess, but I think I'm not far off the mark because I doubt our upkeep is that big.
So our 2 free turns =
100 hammers
380 beakers
I also counted all the tiles in the last screens. Since that was a while ago, these numbers are probably conservative. In either case, we will get base gold and base hammer bonuses of:
51 commerce
35 hammer
We have pretty damn good science infrastructure, so I'd put the 51 commerce at 90 beakers conservatively... I wouldn't be surprised if it's actually over 100 because I'm not counting academies or oxford. The 35 hammer is probably worth like 40 final hammers because we don't have many forges AFAIK.
90 x 10 = 900 beakers
40 x 10 = 400 hammers
So all told, we get 1280 beakers and 500 hammers, assuming no population growth from turn 138 or whatever.
Is this worth more than a trade mission? I have no idea how much $$ a trade mission is worth on our map, but the hammer bonus is hard to turn down... I mean, 500 hammers can make like 4.5 cannons.