Welcome to the forums. It is quiet here. The open yahoogroup is more popular, and has a huge file section that you might want to poke around in:
http://games.groups.yahoo.com/group/tekumel/
your Fate3 link gives a "No Site exists for this address" page at wikidot
There have been few complete rpg rules sets published for the setting, given its age, so lots of fans use other systems. I think a rules light system could work fine. My impression is that there is not much consensus among Tekumel fans about what kind of system to use,
There was once a fairly serious effort to create a Tekumel MUSH, but it was never operational, and seems to been abandoned several years ago. Some of the folks who worked on it are still around on the yahoogroup, so you might get more information there.