The bumper is crusty enough it could be wrapped with rope the full width. Those factory pop-outs have lengthened arms so they open wider. Could either get a new set of portawalls, or cut the remains of the old one off.
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What I'm thinking about lately is the Toyota Fun VII concept car.
stuffkorea.blogspot.com/2012/02/toyota-fun-viivehicle-interactive.html
If you lay that curve onto a Beetle body it lays on the rain gutter over the door and extends to a side-tapering tail in the rear and down in front of the front wheels. From other sources, it looks like a cut-down Previa windshield would be the best choice. The snub nose between the blades with wings reminds me of the Volkhart-Sagitta front end updated.
Rocker panels and rear fenders to round it out.