[Duncan]

The problem with a Sprite/Midget - or my Marlin - is space for the batteries
Its relatively easy to get enough batteries for about 50 miles - then it gets more difficult

I already have a short range electric car - so I'm going for a dino burner in my Marlin

If the short range is not a problem then I would suggest simply throwing the gearbox over a hedge and fitting a 9 inch forklift motor in its place
That then gives you the whole engine bay for batteries

 

[Duncan]

The main safety feature that you need is decent seat belts - a collapsible steering column would be a good idea - but is about 100 times less important
The cars that NEED the collapsible column are the ones with a single piece column and a steering box at the very front of the suspension - like the old Corvair
The Sprite has a rack mounted very solidly about two feet back from the front of the car