I'm gonna leave the Boomerang as is for now because I think it makes sense for a wartime emergency design to be imperfect, but I'll probably revisit it eventually. I present Zealandia's first and last completely indigenous jet fighter design, the ZAC, ZA-15 Weasel.
Powered by the Nene 2 jet engine, the ZA-16 was a natural development for the ZAC corporation from its wartime designs and work on the Kangaroo. Work on a super Kangaroo, which was to be powered by one of the several super piston engines developed at the end of World War Two, was canceled in late 1946 and replaced with orders for Gloster Meteors and De Havilland Goblins. However, an indigenous fighter was also designed with the help of international aeronautics engineers like Giuseppe Gabrielli, Kurt Tank, and Emile Dewoitine. It was designed to meet the long range and high speed requirements that Zealandia needed in an interceptor, and that most early jet fighters were lacking in. THe government also wanted to keep ZAC in business during the tough post-war economic years. The first prototype flew in June 1948. It flew 24 successful test flights before having to make an emergency belly landing after entering a dive which the pilot barely got the plane out of. The production version had an increase in the tail's surface area as a result and increased size of the stabilizers. The production version entered service in October 1949, complete with four 20mm Hispano cannons as armament. Speed was a disappointing 574 mph, before a more powerful Nene was added after the 12th production model. Speed was increased to 592 mph on these, with a range of 800 mi, and a ceiling of 50,000 feet. 74 would be built in total, before production ended in 1952, with 16 being exported to Israel, and 24 being exported to India. The rest served well in the Korean war for Zealandia, being modified for ground attack, and managing to achieve 16 victories at the expense of 9 total losses. The Weasel would be retired in 1958 with the advent of the Hawker Hunter.