U Bracket Simple Parametric Discreet

This is my second attempt for a bracket made with openscad. I intend to use this for a mirror that i need to mount at home. Current limitation is that you will only have one screw hole regardless of width. I wish to add a screw hole for every X millimeter there after... current knowledge in openscad limits me.

Sample stl file generated by this thing is enclosed.

Please like, collect, comment, watch, remix or send tip so that I will know that I am doing something useful ...or not. Cheers!