I wanna make my own airsoft gun

I am a huge nerd for the weapons in siege, and I really like the weapon that Lion has, the V308. I talked to some of my friends about to see if it is possible to make Lion's V308 into an actual airsoft weapon. They said it is possible to make it, but it would be hard because I need the body and stock of a vector (which is not cheap), a custom made ar like barrel, and for the mag, I could try to have it be a normal mag or round drum. If anyone wants to give me more details on how to make it, I will gladly accept options and criticism for this. Thank you :)

With converting the ammo, I'll just have it shoot 6mm BBs

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Lion's V308