after the installation of a new water heater and a relatively extensive plumbing fix, I wanted to save a buck trying to patch the drywall myself. It's the very first time I buy a piece of drywall or anything related to this activity. I re-created a map of the pipes on the new drywall using trilateration, then cut the drywall to match the existing, large hole, and cut it in a way that I could fit it.
The existing hole with plumbing:
The patch with holes for plumbing (this will be cut in a half going through the holes):
Poor picture (sorry) of the cut patch:
Dry fit of the "bottom" part of the patch:
Dry fit of the whole patch:
My question is: how much support should I install behind the drywall before I screw it to the metal studs, and start the operation with mud and all of that. I am really clueless, any advice will be appreciated.