Always good to see some more Antares stuff. Some very nice conversion work there. The Native Americans fit very well.
I agree that Antares would benefit greatly from a decent index. Having said that, I found the rules pretty easy to get to grips with largely because it sticks to a few simple mechanisms (order dice and roll under a particular stat on a D10). Because the rules are fairly logical, it's not usually hard to work out what you're doing even if you can't find the exact reference.