I've put a unit together with Blender. It uses the standard archer animations.
I hope it looks like you imagined.
Hey SaibotLieh!! Finally got to check this unit out at the weekend after a disaster with my computer dieing...

bought a new mac now, and thankfully had made a recent back up, so not too much lost.
Wow, this unit works pretty good with the archer animation in play, and I think the unit would be a great addition to many early Civs.
I noticed a couple of glitches with him though and so played about re-skinning him and then could clearly see where the glitches are (pics below). Mainly in fortified position, his neck shows through the shoulder armor. Also, there seems to be a glitch with shoulder armour and the chest area.
I also came up with some feedback on how the Unit could be improved a little, if it is at all possible.
1: While the two swords look great, they seem quite big for the animations and this particular unit when in battle... So, I got to thinking about the swords themselves. They are obviously Claymores, great big heavy swords. I thought about a sword that would be smaller and therfore more appropriate for a unit of speed such as this dual wielding sword warrior using the archer animation. I also thought about the Pictish tribes and the fact that their lighter swords were more like the Roman Gladius... they did not use big swords. So I wondered if the Gladius might look and work better as the swords for this particular unit, as it may be easy to copy them from the Roman Praetorian unit rather than creating a brand new sword.
I wonder, if this is possible, could the Roman Gladius also be scaled down a little in size to make the swords shorter. Usually the dual-swords fighting system would use two shorter swords as they are easier to wield. Also, as eye candy, this would look better and faster when used in conjunction with the archer animations.
2: The unit carries swords in hand in Idle position, then when you select the unit to fortify or defend, he reaches behind him to grab the swords from invisible scabbards on his back, even though he already has the swords in hand. After pondering about this, i wondered if it would be possible to have the swords in visible scabbards on his back while in idle position, then, when in action, he grabs them from behind and they are now in his hands. Not sure how possible that would be, but think it would look cool. What do you think?
Question: the unit looks a little boxy compared with other units. Can this be smoothed out a bit, or is that a difficult process... I think the original archer was quite a boxy looking unit.
Thanks again for putting that together SaibotLieh!!
