This works really well ... although I am not a fan of the 'swastika' X.

nice job. has a fun cartoon feel to it. lots of personality. the X bothers me some - kinda swastiky :(

It's difficult to find a solution that maintains the integrity of the broad slabs ... although that already has to be 'compromised' for the S and Z I don't know what I'm talking about ... I just make all this s**t up :)

Anyways - here are a couple of ideas that I had for the X:

You certainly have - it looks great. A tortuous process perhaps -but with an excellent result :)