Classes and Custom player Models?

Hello All.

I am totally new to Roblox scripting and I am wondering about a couple of things. My project is to bring Insurgency and Squad to Roblox. My 1st question: I have all the clothes down pat but how would I add helmets and vests from the model library? My 2nd question: How would I have two teams with the same classes but different weapons? For example: The IR (Irregular Militia) has an AK47 as its main infantry rifle but on the Allied it they have an M16. The classes I wish to add are: Infantry, Combat engineer, Rocketeer, Machine gunner and Sniper.

1. Helmets and vests could be accessories. You can make custom accessories by using Attachments.

1. Use the same exact code and UI, just create a table that maps the correct weapon name.Maybe like this:

local classes = {
	Infantry = {
		IR = "AK47",
		Allied = "M16"
	};
	...
}