My wife had some more law homework to do, so I figured I might as well head back out to the garage and get to work on the stiffeners.  It took me a little bit to figure out what was going on with the stiffeners.  The places that you are supposed to cut are notched out.  I marked each cut line in blue.  After the first two cuts, I started to cut on the wrong side of one of the lines.  Luckily I only barely touched it, but after that I started coloring in the side that was scrap so I knew which side to cut on without thinking.  I was able to use the scotchbrite wheel to clean up my mistake.  I got through 2/3 of the stiffeners tonight.  For the ones that are done, they have been cut and cleaned up with the scotchbrite wheel, so they are ready to go.

Here is how I started marking the cuts after I made the error.

A quick pic of the harbor freight cutting wheel.  $9.99… can’t beat that!

Here is what I was able to accomplish in this session.