I've been bored recently and had some materials to play with.
I had to angle it upwards a bit because I still need to get in and out of my driveway. Looks like I've barely got clearance:
But overall, not bad for a few hours work I think.
It's flared out (increasing frontal area, I know...) because I plan on having the front wheels entirely enclosed. This was the point where at full lock I've got about an inch between the cardboard and the tire.
...and a view from the top:
