Dear god I'm jealous of this project! Everytime you show more I'm MORE JEALOUS!!!! Excellent work.
I really enjoyed that last video where you show how to procure and add the polystyrene. Also, the fact that you are recycling. Awesome.
I've noticed on earlier portions of this process that you have a numbering / lettering system for the polystyrene. Do you test fit, mark it for location, remove and glue up with the expanding foam? Large sections at a time, obviously. You'd mentioned in an earlier video that once a can is started, it must be used immediately.
Keep up the incredible work. It must feel great having come this far.
Cheers,
Ted.