Awesome~ I think you've made the right call with the mappings following ASCII, it's definitely a lot easier to work with when not being able to see the actual rendered output, compared to using the Private Use Areas with a bunch of s — and trying to match glyphs would be a tall task too, not to mention resulting in rather scattered mappings. Keep on making cool stuff, it's always great to see!
I'm sure this isn't the place for the discussion, but feel free to ping me if Batfeula has trouble with the mappings on CHUNKY, what with the character widths and such being a little off currently on the TTF. (Although given how clean FROGBLOCK is, I'm sure you'll manage just fine :D)