Angle Metal Sleeve

I have need to work with angle metal. I want to create various fittings to allow attaching an angled thing to walls, other things, and other pieces of metal, rods, and whatnot.

This thing is a base form upon which other angle metal fixtures will be created. By default it was designed as a slip on sleeve to fit 1/8" X 3/4" angle aluminum.

With the OpenScad, you can easily change the size of the fixture. You can change the thickness (1/8") or the extent (3/4"), and the length of the sleev