ZMR250 / QAV250 grows to ZMR430 Quadcopter. Concept Frame Build with Plywood and M3 Bolts.

My latest project is to expand a ZMR250 to a ZMR 420 so it can use 9 inch Props.and 2826 or 2212 motors. Liking it so far.
I was not going to do another wooden Quad but I was looking at how expensive larger QAV H style Quadcopters are and thought its time to build it in Ply.
I did have to go and buy some bolts so the frame cost is $12