new builder attempting a foam pack

Hi my name is Spencer, my dad and I made a proton pack out of wood back when I was in high school and i’m looking at doing a lighter pack on my own now that I have a need for a second pack. My current idea is to find some foam builds. I’ve seen only a couple out there so anyone out there that has any experience with it i would really appreciate the advice.

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http://www.gbfans.com/community/viewtopic.php?f=2&t=27352

http://www.gbfans.com/community/viewtopic.php?t=22403

http://www.gbfans.com/community/viewtopic.php?f=2&t=21827

http://www.gbfans.com/community/viewtopic.php?f=2&t=35973