Stepped Double Door Frame

I made this to slide onto the edge of a 1mm thick sheet of plexiglass which I use as a door for my printer enclosure. Printing enough of these combined with similar corner pieces and other straight pieces for the top and bottom edges gives the thin plexiglass some rigidity. This piece provides a stepped overlap where I can attach some magnetic strips to ensure a good seal in the center where the doors meet. The gap where the strips go is 2mm wide.