UPDATE (27-06-2012 or 06-27-2012 depending on which side of the Atlantic you happen to be on): This has recently been posted on GameFAQs and someone there pointed out that there is a Instrubtable giving you the parts list for this. I’ve also blogged about that.
If you wanted to condense my childhood toys into a single artefact you’d struggle to beat this creation by Julius of MocPages. It’s a Nintendo GameBoy made out of Lego that is also a Transformer! Based roughly on Sound Wave the detail on this piece is immense, the the batteries turn into his guns, and the Tetris Cartridge actually transforms into something that looks an aweful lot like Lazer Beak.
What’s more it’s not his only Nintendo Transformer made out of Lego, he’s also made a Nintendo Light Gun Transformer entitled PlasmaShock this looks like it’s based on the Decepticon Jet toys (Why not Megatron?):