@mwichary This is very cool, and the kind of thing I am very interested in - so much so that I snagged the unicode.exposed domain a while back (a la https://float.exposed/) and then didn't get far enough in that project to be worth putting up there 
If you'd like to take over that domain for this project, feel free to message me! I'd also be interested in collaborating a bit, but as indicated by my half-finished attempt, that may be overambitious. Here's where I left off on my own explorations, you made much more progress than I did, and obviously took a different tack: https://mahogany-waiting-treatment.glitch.me/
My initial interest is in breaking down the mystery of "how do computers represent things", particularly around text encoding, but I also had ambitions parallel to yours - particularly the Observations panel is a brilliant little way to highlight some of the info I wanted to capture. Thanks for this!