Wow!  The bender works perfectly.  No more hot iron pipes for me  🙂 !  On a pipe, I always had a bit of spring-back or I had issues with the two long edges not being perfectly parallel.  Not so using a bender.  I made the form (the item with aluminum bars) slightly smaller than I needed so the outside edge of the bent side would match the inside edge of the concert mold.

The 3rd photo has the sides in the mold.   The mold and spreaders for the mold were two (more) jigs I needed to make for Mark’s Concert given I’ve never made a concert before.