Plastic beams

Hi Guys, I am new here, I see in Daves latest video he mentioned Plastic beams which interested me a lot as I have been working on modular house construction ideas and think that this could be a great part of one am looking to do. Could someone please point me in the direction of more information on these, please.
http://a360.co/2yqfZhF

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https://preciousplastic.com/en/videos/create/techniques.html Last video! 🙂