Had some spare time, so here's my contribution to the crowdcad Beetle project.
The hardest part was finding dimensions, the only dimensions I had to work with was the the diameter, width and offset (15" X 4.5" X 4.5") the rest was from reference pictures off the net, so guesstimation was involved, some inaccuracies may be evident.
The tyre pattern was rough and whatever, only for visuals.

Step file from MoI.