Generator Quiet BOX Built with GoBoard Backer Board

Update on my GoBoard Generator Quiet Box! This quite box, baffle box reduces the sound of a generator.
Generator Video's: Quiet Box Part 1:
https://www.youtube.com/watch?v=xGt97K2Bobw
Quiet Box Part 2:
https://www.youtube.com/watch?v=efmkyWbWof8
Harbor Freight Predator 2000 Generator:
https://www.youtube.com/watch?v=hXbHrSP9d6c
Predator 2000 Generator Ultimate Tool Test
https://www.youtube.com/watch?v=kVAn7Nlsftk
Firman 3200w Inverter Generator Review with Quiet Box:
https://www.youtube.com/watch?v=Y4megRvGx1M

Tools we use: https://www.amazon.com/shop/landbergtilediytv