Real time modding brother, and don't worry. the people that found the offsets and values to create the modded classes like that! will not be releasing it...
I gave it a go my self, found the primary weapon offset and started changing the code made my classes like fucked as. close to his in the vid "checker boarded" primary weapon, attachments and perks all were set to 0x33, }; lol
but when i joined a game, i could choose the modded class, but was giving a stock M4A1 =(
Some one will release it. one day