Whew! Really dodged a bullet there.
The floor in my Rockwood is a sandwich made of plywood with styrofoam in the middle. Easy enough to drill through with a 2" hole saw, right?
Styrofoam isn't the only thing in the sandwich. While drilling a 2" hole to install a feed through for antenna cables I discoverd, to my horror, there are two aluminium box channels that are just chock full of wiring imbedded in the floor material -- not under
the floor, I looked, but inside
the floor, a few inches in from the exterior wall.
The good news is that none of the wires were damaged, and the hole is located in a cabinet so there's not really an eyesore problem. I drilled a few "exploratory" holes a few inches over and got a good hole (nothing but styrofoam there) for my feed through.
When I get done I'll post pictures...this weekend.