Buy a $15 Blitzwing from Big W, put a $10 titan master on, a bit of paint and a junker G1 Brawl cannon and voila!
I de-planed the base figure - removed the wings, rear stabilisers (I left the posts in to secure tank mode) and the jet nose, leaving a space for the titan master to chill in.
His secondary guns are toothpicks!




Because I've turned the mold around, he's now a jet-powered tank!





There are some good creations on Shapeways, but shipping is a killer so I'll build up a wish list before shopping there.