While there's always a ton of good customs on eBay and TFW, there are only a few that I see and immediately say "I need to make one" or "I need to buy it." This is one of them.
I gotta hand it to you, My 4 year old took one look at the first bot mode pic and knew it was Knock out right away. Great job, alt mode is killer.
I don't have the figure yet. How is the head attached, swivel? Ball joint? And was it easy to remove?