Very nice, I did something similar a while back and was going to make a poster of interesting ones to hang in my office: https://www.telkins.com/blog/visualizing-file-formats

Never got around to that poster though. :(

If anyone is interested we open-sourced https://github.com/getsentry/launchpad which can produce a treemap visualization for Mach-O. I've been working on ELF support in my free time too but it's not finished.