dji inspire arm lifting mechanism

I have redesigned the arm lifting mechanism to accommodate a brash nut for an 8mm trapezoidal lead screw (the same as many 3d printers). Also, there are holes to run the wires for the limit switches.
Check out the "low-tech" wiring diagram on rcgroups for a super simple solution to wire the limit switches to the servo, no complicated stuff, just add two diodes and some wire! no arduino or anything else!
http://www.rcgroups.com/forums/showthread.php?t=2327044

The rod adaptor screws to a r