Cool!! another home grown machine
I built one from scatch about 15 years ago called it "Vortex" it had two playfields, one beneath a perspex window in the main pf, similar to Black Hole/Haunted House but turned around the opposite way.. there is a thread on her somewhere.. i'll find it and post a link to it just incase you havent seen it yet.
I still have it up and running, its about to undergo yet more mods/upgrades soon.
Keen to see what you come up with as im sure everyone else will be.. let the work begin!!
EDIT: heres the link to mine in case you havent already seen it, i have since added speech to the game since i posted this thread!!
http://aussiepinball.com/index.php?topic=504.0
