That.. Is a very good question.
This was the only picture I could find that wasn’t fanart. I know there’s a cartoon of some kind but looks like he’s not too popular?? I don’t know.
His helmet is basically a fish bowl, by the looks of it. You’d probably have to have some experience in working with plastic for it. Some may be content with just making the collar piece near the bottom.
Do my followers have any suggestions?? For once, I’m stumped!