Man this is so awesome! I love it, nice work.
I've never heard of shadow foam before, but will check it out. I attempted something similar a while back with my Switch using this packaging foam and a scalpel. Had a smart flight case for it to sit inside as well.
The cut out I made wasn't as clean as I had hoped tbh, it was functional, but not smart enough for my liking.
Maybe it's something I'll revisit in the future using this stuff.