Super Customizable Lego Technic Beam

My daughter and I enjoy tinkering around with the EV3 Lego robot set quite a bit, but I've always felt like it needed a more structurally solid frame for assembling the various motors and sensors to the command module.
I discovered Steve Medwin's amazing [Customizable Straight Beam for LEGO Technic](https://www.thingiverse.com/thing:630626) and started tinkering with making L-shaped brackets. After a bit of tinkering, I then found Sam Kass' improved model, [Even More Customizable Straight Beam for LEGO Technic](https://www.thingiverse.com/thing:1119651).
These models are amazing, and I give mad props to Steve and Sam for their incredible work, but they were still limited to creating straight beams, which wasn't going to give my frame the rigidity I wanted. I was interested in the possibility of creating more complex shapes, and this is my first stab at doing so.
You can use this to create L, T, #, or square brackets.

You can specify the types of holes created on the vertical and