Hi St4rk! I subscribe to and love your build-orders series! Love them! Thanks! Would love to see some more!
My TOP PICK would be... "Scouts into Castle Drop" (i.e. go scouts in feudal but then want to get a castle up early in Castle Age to make Unique's). Varies of course by type/cost of UU going to be made, but I'll bet there's a good video in there. "Men at Arms into Castle Drop" would be good too, etc.
Likewise another straight "Castle Drop" for a different race than Mayans (i.e. Unique Units with a food-intensive economy rather than wood-intensive).
"Fast Imperial" would also be pretty awesome, with-or-without the special Turkish flavor.
Custom build orders by race too, I would definitely watch every single one of!