Here's the first test version of the new Class System. If you don't wanna ruin your current game, copy the whole game folder to another folder and run it from there(I dunno if this works with the Steam version).
Then copy these files to your \7.62\Quests\mods\RAS\ folder and start a new game.
Enter your Kill Book and choose a class.
Once you've killed your first 20 enemies, enter the Kill Book again and select "Level Up"
I haven't put a cap on the skills yet, you can raise it as high as you wan't. Try to keep an eye on where the game engine starts to have problems with the high skill level. As of now I'm thinking of capping it at 200, but if some skills can be raised without problems I might increase the cap for those skills.
Class System v1 beta
Have fun
R@S
Oh, and one more thing, I've added a cheat to make the testing easier. Just open the console and write
throw cheatlvl and you'll be given 5 points to spend. Keep in mind that you can do this as many time you like, but don't spend them all at once, there's a limit to how long a dialog can get, and if it's too long it'll CTD.