The stability of the aircraft with the original V-tail was marginal at best and clearly needed a redesign. With the original fibreglass fuselage, this was a time-consuming process, so the decision was made to switch to an all-metal fuselage with the components incorporating compound curves produced using hydroformed aircraft-grade aluminum alloy. These could be modified with relative ease during the testing cycle. It also made economic sense as the orders rolled in, the $30,000 in tooling would be spread over what was now a large order book.