TBH I like the idea in general however I see a problem with your cost to maintain the village.
You need half of what you produce in your village correct? (just one of the 3 as far as I got it)
Now you would need to trade the other half for both the other items.
To me that would lack balance as the other villages would need to sell you the items for less than they would need to maintain their status quo.
On another note I do not see many people buying t1 weapons and that even outside their base. So unless you would feed the trader you wouldnt get much income at all.
A nice thing would be if you could access an villiage mine if you are in their platoon or faction where you could mine for example. Or just having the traders carry gecko pelts, chitin scraps and so on.
And lastly I think 6 villiages would be that great. Its 4 factions so in my opinion it should be a factor of 4
.