Mark 4 build - step 1: Triangles: parts

I've started on the build for Bertha Mark 4, along with several other folks at the Nova Labs Makerspace in Reston.  So, we'll need build instructions!  Here's the first step, building the triangles.  I'll post step-wise Bills of Materials, then at the end do another sum-up and make sure that it's correct.

Vitamins:

• 6   * 350mm 2060 aluminum extrusion (Misumi)
• 84 * M5 by 10mm flat head cap screw (Open Builds Part Store) - 14 per vertex
• 72 * M5 Stamped T-nuts (open builds) - 12 per vertex
• 12 * M3 by 10mm button cap screws
• 12 * M3 washers
• 3   * Nema 17 motors 
• 1   * 625 bearing
• 2   * M5 by 25mm button cap screws
• 2   * M5 nuts

RepRapped Parts:

• 3   * Idler Bracket (idler_bracket.stl)
• 3   * Motor Bracket (motor_bracket.stl)
• 3   * Idler Slider (idler_slider.stl)

Tools: 

• M5 by .80 Tap
• Tap Handle
• 3mm Ball-end hex key
• 2mm Ball-end hex key
• Knife for part cleaning - exacto or similar

Trust me on the ball end thing - most of the screwholes will get covered up as you build, and space is tight.  I've ensured that it can be assembled just using the short ends of the hex keys, but it would take a toll on your sanity.  You can use any m3 screws that are 10mm long, but the m5 flat head screws are necessary for clearance on some of the M5 parts.  Note that the hex keys are smaller on button and flat head screws.