Joining Strips

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Joining Strips
The joining strips are designed to work with my extrusion and actuator mounts.
http://www.thingiverse.com/thing:213749
http://www.thingiverse.com/thing:213762
They can be be used in conjunction with angle and pivot plates to create many different kinds of models.
http://www.thingiverse.com/thing:213750
http://www.thingiverse.com/thing:213770
The spacing between the holes is 20mm x 20mm and the diameter of the holes is 5mm. They are designed to be used with off the shelf M4 screws.
These plates can be used with our gears to build different gear trains.
http://www.thingiverse.com/thing:214043
NOTES:
We are planning to get many of these parts molded so "makers" can buy em cheap and use for their projects. We need your feedback --
1. What other parts would you like added to the library?
2. What colors should different parts be molded in?