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Creating hollow, clear mold. What materials? Answered

I'm trying to create a Metroid from the titular video game series but I'm not sure of which direction I should go.

As you can see, the top (i''ll call it the "head") is semi clear but contains a nucleus within it. So far the only method I can think of is with clear resin. Issues though are that I dont know how to leave an empty space for the body to fit within the head and I dont have a pressure pot available. I've never created a mold before and my only experience is clay sculptures.
What methods could I use to create this? All I have to work with is my garage and some clay at the moment and although I'm willing to go out and spend some money, I wont be buying something like a $300 pressure pot.


use silicone or oogoo

You may be able to get away with some crude blow molding freehand of clear thin sheet styrene or plastic. Use a heat gun(industrial mega-hair dryer with wide tip) and some nonstick tools to prod and shape a softened sheet of plastic from an oven or heat lamp. Heat until pliable but not melted. Vacuum forming would also work. Think along the lines of a glassblower. Create the bulb shape and go from there. You can then sculpt the nerves separately and stuff it inside. Good luck.