From looking at the pictures, I think you could blend the body lines of the gas tank back to the tub with the body material of your choice. Obviously leaving a hole for the motor & what ever accessories need cooling.
Rear fender flairs. You could move the front edge of the flairs forward allowing you to reduce the abrupt angle of the flair. I think moon covers are out of the question, but if you make your outer beadlock ring "full disk" as possible (current F1 cars as an example) it should help aerodynamically. if you have the resources you could screw on a carbon fibre plate to the beadlock ring to reduce rotating mass.
Don
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