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…but I’m not trying to discourage you.
I have poured and created jigs for a long time…it is fun and rewarding. However the Multi color, gitter, clear (chip proof) styles like the H20 Precisions and similar styles (with wire plastic keepers) cannot be recreated by a do it your selfer as cheap as you can buy them at Everts of BFT…I’ll add the Scenics to that list. It takes specialized molds, materials, and techniques.
That said…I would NOT discourage anyone from trying it and enjoying it…Standard collared, powder dipped, barbed jigs can be made for about 10-20c ea depending on hook quality and quantity. After the initial investment it gets better! 
But you can