For some fun I decided to make a Mecha Sethrak model and this is the result. The design inspiration is based on Meta Ridley.
Admittedly I think this is very unlikely to ever make its way in the game, but I do think it is fun to discuss. I personally think that if Sethrak was ever playable this would make a hella amazing customization. But I don't think I've ever seen blizzard do customizations this drastic. It would also make for a cool race I think.