How to tie a Roman Helmet?

[Gaius Colletti]

Thanks Scipio, I have already gotten a skull cap, which makes a world of a difference, especially since the trooper helmets are all about 26.9" really helps.

I am already, as Matt Amt predicted, looking into a more accurate helmet. Besides the spade shaped neckguard, "eye brows" on the helmet that meet in the center, a movable and too high mounted visor, as well as too large neck ridges, is there anything else that I should look into before checking out other helmets to tell the difference between a good helmet and another piece of junk?