How to remove outer wheelhouse?

Got my new wheelhouse clamped on awaiting final weld in. I ended up removing the entire old wheelhouse including the flange. The most accessible section on the flange just peeled off (not welded very good or corrosion weakened the weld). The rest that was removed by using a cut off wheel from the bottom/prying with a screwdriver/grind off. Took a while to do. Waiting to do the welding until I mock up the new trunk floor and quarter panel.