I went to a lecture with one of the founders. They are indeed fascinating and quite capable people. Not only have they built an actively guided rocket and launched it up to 8km, nearly vertically, but before they started Copenhagen Suborbitals they had already built several submarines (including one that had a toilet _and_ shower) all of which where quite seat-worthy.

They built them using very little money, because they didn't have that much forexample to make the g-test for their rocket they borrowed a free fall attraction in a local amusement park.

Copenhagen Suborbitals truly have the hacker spirit.