Walker's Over-Engineered SEEJ Engine

My modifications to the SEEJ starter Set from 2013- I liked the pennies rather than the cannonballs.
Overall, changes have been made to pretty much every element.

• The struts are thinner and the axis has been moved.
• I made it a little skinnier overall, just to save plastic.-- I've noticed that this is a flaw and I'm going to make a wide-body version soon
• The atlas is deeper and includes some sights for aim.
• The rear bar includes a trigger system- The pins are pretty tiny, though, a piece of wire serves better.
• The front bar now has prongs for mounting to a height bar that will let you, when mounted to the base, aim up or down by 5 degree increments.
• The base is new, includes a hole for centering on a drawn or printed compass, and a line cutout to view your angle. The struts mount on the new rear hinge.
• Added peg holes on each side to mount penny caddies for ammo (Also gives you some mass)
• Guides on the struts AND the new throwing arm to slot your rubber bands into, to make cleaner twists.
• Arm is longer, can be printed without supports.
• The key now has a cutout, so that you can add a rubber band without cutting or knotting. Rubber bands simply fit over the entire machine and slot in.

Suggestions for further modifications are appreciated!
More pictures to come.