good thinking Sir Barnaby.......to be honest i will get quite a few types done .the long ..the short..and the fat!! 
im sure the weapons dumps used by the Aztecs contained all sizes and
shapes and various woods as other tribes paid tribute as only they could.
still ir would be good to have as may veried types of weapons ..the
"hockey sticks" as well as all the unusal semi-documented types
regards
Ged
www.gringo40s.com
www.gringo40s.blogspot.com
I think all are right, there is not right and wrong of it, the maqahitl could be in various lengths, one was almost halberd like and it depended upon the fighting style of the warrior (where more adept) whilst for commoners they had armouries in each district so may depend upon the armourer/weapon maker.
It is the classic weapon and I think Bowman was alluding polietly that the axe isnt something that has been seen really in the codeces (not GW mind you

)
Lovely looking figures btw

Perhaps the best known ancient Aztec weapon is the maquahuitl (macahuitl). This is sometimes compared to the sword, and it was a powerful, close contact weapon. Like the European sword, they came in two varieties - one handed and two handed. Made from wood (usually oak), they were about 3-4" wide and 3-4' long. The two handed versions might be slightly wider and as tall as a person. Embedded in the edges was obsidian (volcanic stone) or flint.
The maquahuitls were incredibly strong, and the Spanish claimed they could chop the head off a horse with one blow. They were sharp and the Aztecs knew how to use them. They could not thrust like a sword, and so they lent themselves to a different type of warfare.
The picture of a maquahuitl is from The Book of the Sword by Richard Burton. Most likely the maquahuitl usually had simpler grips.
Clubs
The maquahuitl could be used as a club, but other types of clubs were used. The cuauhololli was a mace made of wood with a ball at the end. It could be used to smash and crush. Various other types of clubs were commonly used, sometimes just made of wood, other times with embedded stone as the maquahuitl.
Spears and lances
Another common ancient Aztec weapon was the spear. They were extremely sharp, and sometimes over 7 feet long. They didn't have a small point as many spears you may be familiar with, but a blade a foot wide made of smaller stone blades. Theses spears were known to pierce the Spanish armour, and were sharp enough that the warriors could use them to shave. They are called tepoztopilli. Spears were used in Mexico long before the Aztec empire.
Huitzauhqui
A Huitzauhqui was an ancient Aztec weapon, that was essentially a large wooden club, with a solid body which featured the head and the handle. Another melee weapon of the Aztec the Huitzauhqui was used in close quarters and was typically larger than the Macuahuiti, and in many cases had similar obsidian blades attached
Quauhololli
The Quauhololli was essentially a mace or club, typically made from either wood or a combination of wood and stone. The Quauhololli was a melee weapon used by the Aztec and featured a curved handle for ease of striking, and with the mace head, was able to strike foes with solid force.
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Cracking thread on the subject here
http://www.myarmoury.com/talk/viewtopic.php?t=4928