FreeCAD Part Design

I am in the process of building a light fixture. It will be an eight foot long strip LED that will illuminate my living room with indirect light. I currently use a canister light with a single LED bulb. I would prefer to have the light spread out. Today I designed a part to use a bracket to hold a 3/4 x 3/4 inch outer corner molding. I used FreeCAD to design the part. Here is a video going over the concerns and steps I took to design the part.

I then ran the output STL file in Cura to create the gcode. Here is a time lapse of the 3D complete with annoying music I created myself using my KOS2.