ryuu seika
Smash Master
There was call for it in Brawl and there will be call for it again. Brawl's custom stage tournament fell apart when it came to hosting the physical portion of the event (on the side at Apex IIRC) but the stage entry portion was a complete success. With better organization, we could easily have a similar event for Smash 4, especially as stages are now shareable.We never used custom stages in competitive Brawl, why would we do it in Smash 4?
To the OP: Your stages seem to be weirdly uneven and not drawn particularly carefully but some of the concepts are interesting. Space Opera and Volcanic Havoc are both fun reimplementations of Fountain of Dreams' mechanic and your reverse Smashville is cool also.
Space Opera in particular seems rather chaotic but, assuming everyone has the same version of it, the stage IS entirely predictable and involves no killer hazards.
Beach Retreat, on the other hand, seems like it would be anything but viable as it gives floaty characters like Peach and Meta Knight a massive advantage in that they can far more reliably reach the bottom platform. What's even worse is that this advantage is one that promotes a vast amount of camping as it gives such characters a zone in which they cannot be easily approached.
Dusty Dreamland is just a rounded battlefield and thus nothing worth discussing in depth.