67 Dart Build Triangulated 4 link & Mini Tub

Cut tight to the tub from the tub cut/floor intersection point until you are moving parallel to the vehicle centerline, then move it over to the rail. That will leave you plenty of material to make that radius cut at each end. It's a little more work from a cutting standpoint, but, the end result will be nicer.

I would wait to cut the inner fender spots until you get the tub out.