Regarding the wooden case (or in this case THE case) instead of the edges being a sharp 90 degree angle it would be sleeker to make them slightly curved. May-be with a 15mm radius.
Would give it more of a Wurlie vibe - less coffin like. And when totted around would be more able to stand up to the inevitable bangs and bashes.
I can see this may make applying the tolex more difficult if done on all edges - but it could be done on just the four long - lateral edges.
Oh ,and BLACK annodised corner protectors.
Sorry for thinking out loud but I'm a picture framer and I know all about arrises!