Ah, I was thinking more of a spinlaunch thing. Yours would make more sense, but would require a fuckton of industry in space or on the moon to have it work. I wonder how much more effective a self contained spinlaunch style thing would be on the moon.

You still need to fire an engine on the far side of your orbit though which makes it more difficult as it still needs to be able to propel itself (while surviving the acceleration)