Well, there are some really small Mp3 players and iPod nano's you can shove in its chest...speakers are a little more tricky, maybe take some premium $300 earphones, gut the speakers and wires, and tape them to Soundwave's legs..
ge
If you do follow through with my...er, suggestion, please post pictures pf your "Masterpiece" kitbash.
Do ala, impressionism or surrealism, possibly dodaism...