Basically a small team is making a low budget zombie movie in an abandoned building. They come across a corpse inside of some strange machine, and decide to activate it, and possibly include it in the film. Upon activating the machine, they open up a portal to another world, and the corpse turns into a zombie king, who unleashes his zombie army.
Never seen it, but the IMDB description looks promising, as does your own synopsis. But I have to ask: can it possibly be as good as Chopper Chicks in Zombie Town?