1. Pretty neat to switch encoding in the middle of the URL. It does look like it works and it does look like a better encoding. This is cool.
2. I'd have called this base-1000. It's using 3-digit numbers encoded into 10 bits. Base64 doesn't encode into 64 bits, it uses 64 characters encoded into 6 bits. And this encoding uses 000 to 999, encoded into 10 bits. But that messes up the title when you compare apples to apples, 1000 > 64 is just obvious and true.
2. I'd have called this base-1000. It's using 3-digit numbers encoded into 10 bits. Base64 doesn't encode into 64 bits, it uses 64 characters encoded into 6 bits. And this encoding uses 000 to 999, encoded into 10 bits. But that messes up the title when you compare apples to apples, 1000 > 64 is just obvious and true.