Hi Ahriman, welcome back!
Nice work on that vambrace.
Helmets of the type you described were used in India from the 16th-19th century (and probably a lot earlier).
Here's one from the Royal Armouries in Leeds:
Another one from the Royal armouries:
This one is from "Hindu Arms and Ritual" by Robert Elgood:
http://i4.photobucket.com/albums/y11...6th-17thC3.jpg
You seem to be going for a very Indian look at the moment.
Other helmets of the same type from the Royal Armouries:
http://i4.photobucket.com/albums/y11...ate_17th_c.jpg
http://i4.photobucket.com/albums/y11...ard_17th_c.jpg
Oh yes, I recently found this picture of a 15th century Mamluk Krug, look familiar?
http://i4.photobucket.com/albums/y11...amlukKrug1.jpg