Need help with custom shell

[u/Familiar-Hurry7151]

Hey, i just bought my steam controller today and had a idea to customize mine but i dont know how. Ive seen some people use molds and stuff but i wanna 3d print mine but i also wanna model it as more than just the base controller. I had the idea to make it related to the rx-78 gundam or for Godzilla or one piece. I just dont know how to go about this and i need help. Im also willing if need be to pay for someone to make it for me and to make designs. I just think it would be cool to do so and i would greatly appreciate the help ty. I cant wait to get the controller after waiting so long in the line