>>210804
Never seen nor played one until this moment. Looks amazing.
Before you try to make it for less players, I'd probably try to figure out the core experience of the game.
I think one of the main things that makes it a megagame is having each team distributed into specific roles/a hierarchy, and at least a half-dozen teams.
However you can still design games with less players around this premise. Looking on Megagame-makers it looks like they do Sengoku era Japan, but it would be just as easy to do Three Kingdoms China or make up your own setting.
Honestly though, the key thing seems to be interaction, and the less people you have the less interactive its going to feel.
I'd love to play a mega game with /tg/ sometime. Maybe one can be planned to run over the course of a few days? Reminds me a little of the Dominion 4 games on /v/