As for the templates that were requested, I dont have any pre-drawn templates, but I will explain as best as i can how I did mine.
1. I cut out visor extentions out of card board to raise the cheeks ( and creat the thinner T at the eye line) Cut one to the size and shape that you like, then trace that one and cut it out so you have two even card board wedges for each side. Next I used regular elmers glue to glue them in place (use masking tape to hold them in place if they wont stay in place)
2. After your cheek extentions are glued in place and dry tape up the visor ( make sure to use the painters masking tape or a few layers of regular so the paint doest bleed through.
3. Apply your puddy/ bondo substance to build up over the card board wedges ( use what ever you are comfortable using, just make sure it can be sanded) once dry sand down to nice smooth surface, as flush with the rest of the visor as you can.
4. Once you are happy with your sanding you are ready to paint, and thats all on you, I prefer spray paint, it gives a nice even coat, I put down a few layers of red first, then i made a stencle that over lapped the whole red-visor area, I then cut out "battle damage/ chipped areas" to make a stencle of the damaged areas. I taped that over the visor leaving only the areas I wanted silver exposed and put on a few layers of metalic silver. I then out lined the silver chipped area with a dull dark grey/ not quite black ( I found this color in my office so I dont really know what its called) I sprayed some directly into a cup so I could use a paint brush to touch up the edges of the silver chipped areas and add a little depth and worn look to the visor and other areas of the helmet.
All in all thats about it, took me about 3-4 days to do, but I bet if some one really applied their time and energy to this it could be done in two days easy. Here are a few picks of what it looked like after i had sanded the puddy stuff and started adding paint, you can see some imperfections in my sanding of the puddy, I left it like that to add to the worn look. If you have any other questions feel free to ask, I am sorry though, these are the only pics I took while doing this.