Delta Printer Bed Mount (1x1")

This is a bed mount for a delta printer using 80/20 1010 (1") T-Slotted aluminum extrusions. It is designed for use with my vertices (http://www.thingiverse.com/thing:1386783) and horizontal beams of 400mm (15.75") in length. It assumes a bed diameter of 300mm.

Beam mounting is sized for 80/20's button head socket screws and T-Nuts.
The top plates mount with two M3 button head bolts (25mm long) and nuts with nylon inserts.
The design assumes a bed thickness of about 13mm. In my design,