Hello fellow adventurers!

I have been following this D&D adaptation from time to time, although not many information regarding modding and engine scalability I could find. So here is my question: I would like to play half-marilith (Half-Marilith). Ideally my character would have 4 arms armed with 4 silver khopesh/katana. It will be Chaotic Evil alignment.

Is this possible? Will I be able to make a mod to play this race in this game?