Anet A8 2040 V-Slot X Assembly

UPDATE 2017-05-26:
I neglected to give dimensions for the 2040 extrusion:
475mm if you use the printed tensioner
490mm if you use the metal tensioner assembly
These are minimum lengths. A 500mm piece from OpenBuilds would work fine as-is for both.

I've uploaded pics and spec drawing of a metal tensioner assembly. It takes 20-30mm off the total width of the printer.
My prototype in the photos is shorter than the drawing because the 2040 beam was already cut.
You'll need:
Qty1 20x60x5m