One problem, nowadays, with the traditional "Lotus Super 7" configuration is the shortage of suitable front engine-rear drive donor vehicles. The Tiki Car eliminates that drawback by using a front wheel drive unit in a mid-mounted position, driving the rear wheels instead of the front.

Mid-engine advantages

It was Colin Chapman who pioneered the mid-engine configuration in formula one cars, so it's also suitable for use in sports cars, if not the most practical set up.

The usual arguments for a mid-engine layout still apply here, low polar moment of inertia, potential for small frontal area, compact drive train with low inertia etc.

and disadvantages....

The usual arguments against, are lack of storage space, practicality, and possibly access for maintenance.

Fortunately, we are not alone, the use of a FWD unit in the rear has been done before by the major manufactures e.g. Pontiac Fiero, Fiat X1/9, Toyota MR2 and so on, so there are ideas (if not actual parts) already out there.