How i can model this car in a plastic chasis?

I need to make a plastic chasis model of this car. It also have 4 parts:
*Seat cover
*left tire cover
*right tire cover
*principal structure
The importan sketch is on pen, the pencil sketch is only reference of the interior.

I need to do a plastic model, a chasis, the shell of the motor tricycle, and i don't know how.
I did try to star with the contour with split line tool, but i don't know how continue.

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