Quad Copter APM with modular system

This is related to my http://www.thingiverse.com/thing:146849 modular system. My last quad crashed, ruining the frame and props, but the electronics were all fine.
This quad is based off .5 inch square dowels. The top is based off of my modular system, so the same components will connect, but I modified it to have screw holes that line up with the base. Due to bridging not leaving the flattest surface, I made the square dowel holes in the components taller to prevent needing a lot of cleanu