Inverted Cantilever Delta

** WORK IN PROGRESS -- design commentary is occurring in the #RepRap IRC channel on FreeNode and in [this](http://forums.reprap.org/read.php?166,717609,718085) forum thread. **

This is an inverted cantilever delta 3D printer, in the same evolutionary tree as the RepRap GUS Simpson and Solidus Labs' Dogleg GDR. I thought I saw a unique way to solve the motion platform problems by adding a parallel linkage and moving the motor to the bottom link, where it's driven by a fixed gear/pulley system instead of a winch+spring or motor-at-the-top like the current approaches.