I been trying to make a blood sport helmet for a awhile made a silicone mould of helmet is it possible to get clear resin for slush casting to make the helmet see through.
If you already have a mold of your helmet, you can cast the visor region in a heat-tolerant material like Ultracal 30 and use that as a buck to vacuum-form over.
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This course covers making your own vacuum-forming machine and helmet fabrication:
https://www.stanwinstonschool.com/tutorials/making-a-sci-fi-helmet-vacuum-forming-machine
If you already have a mold of your helmet, you can cast the visor region in a heat-tolerant material like Ultracal 30 and use that as a buck to vacuum-form over.
/Chris