Great read and game here, Alpaca !!
For those interested, last week I played a similar strat using Iroquois on my usual Immortal Small Pangaea map. Playing the vanilla game and using culture and my default Meritocracy for happiness, I had by far the most crushing easy win on a Immortal single land mass map for me.
Great War Path meant lots fewer roads to build. Also from reading here, I learned to be more aggressive when planning ICS, if the opportunity is there. To my east, both Sully and Liz didn't seem to be growing as fast as I'd seen civs do on Immortal, so I went conquering and puppeting and needed fewer road tiles to connect the eastern empire to my central capitol.
Iroquois, even a mini-ICS and great warpath is very strong.
.. thx .. neilkaz ..