I had a quick peek around earlier tonight, and found the websites for 3 different but very interesting New Zealand aircraft manufacturers. Each of these manufacturers build complete aircraft - they are not just making parts for others [although there's a bit of that happening as well].
Interesting thing is that all three of these are located very close to each other. PAC and Alpha are based at Hamilton International Airport, and Microaviation is at Te Kowhai, a privately owned airfield just a few minutes flight from Hamilton.
There's bound to be more that I don't [yet] know about, so let me know and I'll add them in.