Transformers concept: Bombarder

Yeah I know I'm kinda breaking my 'ballpoint only' rule here, but I wanted to get this one particularly mistake-free and I wanted soft lines (not harsh, scribbly ones like many of my other pieces). Transformers Armada is one of my favorite Transformers series, and Bombarder is designed with that style in mind. He transforms into a gun tractor (I actually thought this out) and has working tracks and fold-down pieces of his armor which reveal missile racks. See if you can figure out how he transforms...

Transformers Armada and related characters belongs to Hasbro, but this design and concept is all mine. ^_^