So I am working on modeling a transmission housing for a tractor. When the team built the part, they sanded it and bent the metal to make it fit, so now it's a very odd shape. It is not even on both sides; I usually will use a spline and a sweep to create curved profiles but they have all been even on both sides. I don't know the best way to go about modeling this. Any direction to start with would be greatly appreciated! I'm pretty comfortable with anything on the features tab, but surfaces and such I'm new to. It also has a circle extruded from the curved face, and I have no idea how to go about dealing with that.
Thanks for the help!