Cutting out the window imprint ribs

The Ford Transit has predetermined locations for the windows with imprints built into the sides of the van. Today I screened off the area where the cutting will be taking place to keep the metal dust and tiny metal bits from the nibbler (being used tomorrow) from getting everywhere.  The double sided tape was awesome (I saw a guy on YouTube use it to hold up a garbage bag to catch metal bits when cutting for his Maxxair fan install). For about $5 the roll was enough for installing the two Max fans the other day and all of the tarp shown below.

I used a Dremel Sawmax with a metal cutting disc to cut the ribs. I can see why the professional guy (in Quebec) that I watched on YouTube used a high speed air tool and disc. With the Dremel all of the sparks were concentrated into the cutting area due to the protective guard - this made it quite difficult to see where I was cutting. On the other hand when I watched the pro do it he had LOTS of sparks flying into his face. I only had a few... All the ribs are out and tomorrow I do some practice with the nibbler!