Can I use my car as a car base?

We must to clarify the difference between donor car (which give parts for use in a tubular chassis) and base car (which basically only change the exterior and/or interior without changing structure).

Decisions are a matter for the new car. Whether it is a replica, or a custom design, all the cars do not serve this purpose.

Mind on this: the structure cannot be modified (except at a cost equivalent to a tubular chassis, so it normally ceases to be an interesting option).

We mean the shape and position of the cab on the wheels axles.

Example: A base car as the Nissan 350 Z is ideal for Ferrari California style car, but it would be completely wrong for a Lamborghini Aventador style design.