God, I love this so much! I'm 57 and grew up on Looney Toons. Marvin is one of my favorite characters, and your raygun made me laugh out loud. I still remember when Bugs stole the Space Modulator and Marvin asks, "Where's the kaboom? There was supposed to be an Earth-shattering kaboom?"
If I can nitpick one thing: It's spelled "DIsintegration" -- but I can't find an image to see whether or not Marvin misspelled his! (Love the "ACME" font, though!!)
I love Marvin, so I thought I'd make a 'human-sized' version of his Raygun. I know the spelling is wrong on the decal, did it on purpose...