If I remember right a number of A-4E's are modified A-4 C's. Ditto on the Hasagawa A-4's being the best choice. If you want a prototype A-4 get the old Lindberg kit. Said with tongue in cheek and more than a bit cheeky. It is however a good representation of the earliest Skyhawk. The early skyhawk weighed 8000 pounds empty and would qualify as a light aircraft by FAA standards. It is a great old bird. Think about it, they started production in the early 1950s and are still flying.