Cut the stiffeners. Tried band saw first with a little piece of wood under the stiffener but it chattered way too much. A half inch hardwood scrap worked great, no chattering.
Cleco'ed everything together ready for drilling.
It has been 100+ for over a month in a row now making it next to impossible to work after 10AM or before 8PM. Need to pull a high amp service to a/c the garage.