Some of the wallboard cuts are pretty complex. Here is one around a place where the pipes transition from being in the wall, to running through the "chase".
Putting up panels on the ceiling. 3/8" BC sanded plywood. I added counter-sinks where I was going to put the screws, and did a round-over with a router on the matched edges. I touched up the sanding with a belt sander. This was the third ceiling sheet, and it fit perfectly the first time.
I gnawed a hole in the floor to put a gas line through. I drilled a lot of holes real close together, and then drilled them bigger. Thanks, Rusty, for lending me the drill!
My wife found this cheap little cutter, and we've used one for the rubber roof, and this one made quick work of the re-reused billboard tarp -- trimming the excess.
Finished the bathroom, and put up a tarp on the ceiling as a vapor barrier. We had gotten this tarp a long time ago, to cover up our house while it was being built, and now I'm able to reuse it as a vapor barrier.