Making Race Mod, Want Pointers

[Icantevenname]

I'm no stranger to modding, but I am new at modding things that involve 3D assets. I want to make a race mod that adds Inklings and Octolings from Splatoon to the world of Fallout. (Both game's backstories involve nukes, so why not?) I'm using the vanilla bodies and heads as a base. I wanna ask for some advice. Just about any, I'm really new to moddling 3D assets. I'm using Blender, but I have some experience with 3DSMax.

Also, I can't make up my mind if I want my race mod to keep the human-heavy appearance of the original Inklings, or to lean more into the squid side of things. Hearing something from someone else might help me make up my mind.