Can I make a silicon mold of this?

I tried Sculpey mold maker but I don't like the results :wacko

I just want to make a mold of this and I'm gonna look for a housing for this.
Sculpey Mold Maker Review - YouTube


Do I just do this method and glue it so it doesn't float?
XRobots - Iron Man life size suit costume 3D printed parts, silicone moulding and casting - YouTube