2020 Threaded Rod Brace

I really liked butchja's 2020 frame brace, but I wanted to use threaded rods readily available at my local hardware stores. So instead of just modified his file to accept 3/8" threaded rods, I designed a openscad file to try to replicate the original design as best as possible.

The included stl file is for the 3/8" threaded rod at a 45 degree angle.

About the OpenSCAD file:
* The openscad file is a bit rough, a few hardcoded numbers inside the main rendering function, but it works.
* The nut inset needs to be adjusted (nut don't go that far down.)
* Only certain degrees is going to work in the openscad file, I have no checks in place for out of bound angles.
* I don't know how to do rounded edges in openscad, but that shouldn't be a problem.