I've already worked out how to make the piston arms into a drumset (swiveling so each piston becomes two drumheads with a split-level effect), and the drumsticks clip over Soundwave's hands or become the backpack antennae for Frumbly.
I was going to use the cymbals for the backpack antennas. Actually, I was going to do a double-bass drum, so you'd be able to do Frenzy as a drum set, or Rumble as a drum set, or Frenzy + Rumble as a biiiig drum set.
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then I was gonna position Hack and Slash at it.
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