Re loadable small steam cannon- REQUEST

I am wanting to create a small re loadable steam cannon that preferably has around ten shots and can fire bombs, i would like help thinking how to do this because i want it very small.

 

On it.

 

Dang, it's hard.

 

^^
Have i ever told you about the definition of besieganity?

 

i think i can do it now, its been a while since i posted this.

 

Basically, my solution is a rotating Ferris Wheel with rockets and bombs. Problem is, when I try to light the rockets on fire...