While I have been going on about Bronze Age adventures, I am really more interested in the late bronze / early iron age Roman republic age. I have been casting about for the rules I want to use, and have narrowed it down to RuneQuest (because, let's face it, it screams ancient) and Spellcraft & Swordplay by Jason Vey (a really cool game). I have almost scrapped the idea of an all hobbit filled culture (though I may come back to that one day).
Looking at the armor tables for Spellcraft & Swordplay, I would alter it a bit for my age as follows:
None AC 1
Linen / Soft Leather AC 2
Boiled Leather / Bronze Breastplate AC 4
Chain Shirt (Lorica Hamata) AC 5
Shields give a -1 to one attacker / round
This is using the deluxe rules and optional shield rule from Monstrous Mayhem. Otherwise, I would leave the weapons table as it is.
Now I think I will work up a river valley map using the random terrain generation (much like Al has done here.)