New Project-Steampunk Mech

So, after my 4th of July project-I received alot of compliments about my mech (which didn't burn). So I am creating a series of 10 inch steampunk mechs. I just started on my first one-but here is the original







And here is where the hand launched off as planned and exploded. The gun fell off after the first missle took off-then spun in circles while the other 5 shot out. Then the smoke came, but no explosion. It now sits in my window.......handless.