I just did some testing. I'd amend the PPP to the following (
Workers numbered as per test file. Newly produced Worker = "Worker 6." Worker on Rice = "Worker 5."):
T46
PlastDukeberg. Build Research. Work Pig/Lake.
Bronze Beaver. Switch to Granary.
Worker 6. Move 1NW.
Worker 4. Move 2N. Road (2/2).
Worker 5. Move 1W.
Worker 3. Chop (1/3).
Worker 1. Mine (3/4).
Worker 2. Road (2/2).
T47
Bronze Beaver. Whip Granary. Immediately switch to Research.
Pyramid City. Work Banana Hill and Grassland Hill.
Worker 1. Mine (4/4).
Worker 6. Road (1/2).
Worker 4. Move 1NE.
Worker 5. Chop (1/3).
Worker 2. Move 3N.
Worker 3. Chop (2/3).
Science at 70%. (9 gold banked, -9GPT)
T48
Mathematics. Science at 0%.
PlastDukeberg. Switch to Settler. Work Pigs, Grassland Hill.
Pyramid City. Work Rice, Banana Hill. Switch to Pyramids.
Bronze Beaver. Switch to Granary.
Stone Island. Switch to Work Boat.
Worker 1. Move 1SE. Road (1/2).
Worker 2. Chop (1/3).
Worker 3. Chop (3/3).
Worker 4. Road (1/2).
Worker 5. Chop (2/3).
Worker 6. Road (2/2).
T49
PlastDukeberg. Switch to Settler.
Bronze Beaver. Switch to Worker.
Worker 1. Road (2/2).
Worker 2. Chop (2/3).
Worker 3. Move 1N2W. Chop (1/3).
Worker 4. Road (2/2).
Worker 5. Chop (3/3).
Worker 6. Move 2N1E.
Settler 5. Move 4N.
T50
PlastDukesberg. Switch to Axe. Work Pigs, Banana, Lake.
Settler 5. Move 1N. Found city.
Worker 1. Move 3N3E. Camp (1/4).
Worker 2. Chop (3/3).
Worker 3. Chop and cancel (2/3).
Worker 4. Camp (2/4).
Worker 5. Move 2S1W.
Worker 6. Chop (1/3).
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I think this is the optimal way to play for a few reasons:
We hit Mathematics in T48 without compromising the capital's growth.
T50,
two Workers are available to Camp the Ivory. We can improve the tile a turn sooner.
The Granary in Elephant Bling will be chopped just before the foodbank is halfway full.
Worker 6 can move to the capital's BFC on T54 and complete the final turn of chopping the Forest 1NW. This will let us complete an Axe or a Settler. From there, the Worker can move to chop one of Mid City's inner culture Forests (1N of Mid City).
Worker 5 can build a road on T51-52. Mid City's borders pop on T53, so it can then move back inside to start chopping on the previously roaded Forest (T53/4/5). Once this Forest is clear, Worker 2 can move onto the tile on T55, move 1SW, chop and cancel (1/3). We then have two Workers in place to help with City #6.
All of this is suggestive, not prescriptive.
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@All
In the capital, we can pick between the following build orders:
T53: Settler
T54: Axe
or vice versa
T53: Axe
T54: Settler
Do we whip the Settler and chop into an Axe, or do we whip the Axe and chop into a Settler? City #6 will be connected to the trade network either way. Axe first is safer vs barbs. Settler first is safer vs Mansa, if he tries to claim the spot (Pigs + Marble?).
Incidentally, I'd like to build two further Axes for safety shortly after T50. The rail network serves to funnel barbarians towards city #6.