One of the RM cooler designs, including it here for ref.
I started with perspective lines to make a 2 point reference grid. The most difficult shape was the cockpit that I simplified a bit. While I tried to keep proper perspective in mind, I did "eyeball" some details till they looked correct. I suspect the RM source also has some details off perspective, but it still looks correct.
I used the dreaded Photoshop ellipse tool to make a ellipse shape that I re-used over and over.