I was thinking of an idea for a Marina stage, and it could be something that combines the three big boss battles in MM.
Picture this:
You're standing in a single floating platform over a street, after a few seconds the platform starts moving down the road, and from a side view, Lunar in his Cerberus Alpha is chasing you while firing missiles. You keep fighting your opponents while dodging Lunar's missiles. After a while, the platform will fall down a cliff and Lunar disappears, the battlefield becomes static for a while at the bottom of the cliff as the fighters continue brawling while Tarus on Sasquatch Beta appear in the background throwing rocks at you. Every now and then Tarus will fire the tank's cannon, creating a big explosion you must evade. After another while, the platform will rise into the air (similar to the last part of the Mute City stage), and Merco in his Phoenix Gamma (in bird form) will appear and shoot laser beams from his wings, you must evade him until the stage returns to the street and starts all over again.
Thoughts?