If you want to know what a real pollaxe looks like, try here:http://www.thearma.org/spotlight/NotesLEJEUDELAHACHE.htm
That's the ARMA collection notes on "La Jeu de la Hache", which they have illustrated with prints from Talhoffer and others. That will show exactly what size they were.
And yeah, that one still looks a little funny. I think it's because the pole is WAY too small in diameter.
On length, George Silver: "Of the lengths of the battle axe, halberd, or black bill, or such like weapons of weight, appertaining unto guard or battle. In any of these weapons there needs no just length, but commonly they are, or ought to be five or six foot long, & may not well be used much longer, because of their weights, and being weapons for the wars and battle, when men are joined close together, may thrust, & strike sound blows, with great force both strong and quick. "
Yogi: give me a few days to think about it, and I'll try to cook up a decent pole-axe and pole-hammer. They likely won't be anything too special, but they will at least be decent sizes.