After watching  jarpanda's stream... I just could not help but try out what he was doing myself. This is what I ended up with after... thirty minutes? I haven't the foggiest idea of when I started, so that is a base approximation. But yeah. Pixel art, woo. Cannon arm, woo. (Yes, I made it too big on purpose so I could get the cannon just right, sorta.)

EDIT: About an hour and a half later, this is the result! This is really time consuming, but totally and completely worth it. About halfway through I realized I did not want all of the lines to stand out as much as some, so I did some things differently... overall, I had fun with it, and that is what matters! Now I just have to color and shade!

EDIT2: Finished! I guess...