Parametric Nut Trap for Mostly Printed CNC

Update 12/8/2016:
Added an image of the part dimensioned the variables described for further clarification.

I needed to make a nut trap that would fit with my customized tool holder I am designing to fit a Mastergrip rotary tool I bought at Costco years ago, so I decided to make this part parametric.

Spacing for my tool holder is 53mm distance between holes.

I made a parametric drill jig that will help you drill holes to use with this nut trap. Here is the link to that part: http://www.thingiverse.com/thing:910707

Here is the link to the mastergrip rotary tool holder I made using this size nut trap: http://www.thingiverse.com/thing:909366

You can also open this with Thingiverse Customizer.
Here are the links I used to show me how to get this to work in the customizer.

Here are the links I used for help in making this work in the makerbot customizer.
http://www.makerbot.com/blog/2013/01/23/openscad-design-tips-how-to-make-a-customizable-thing

http://www.makerbot.com/blog/2013/01/18/design-unique-things-easily-with-makerbot-customizer

Here is the link to the openscad template mentioned in the 1st instructable for making your openscad files work with the customizer
http://www.thingiverse.com/thing:44090