Wow. Awesome responses guys. I seriously appreciate all this info. Okay! So! I climbed up on the roof to inspect skylight- all good. I ripped the sink out from the wall (the issue I suspected was causing he buldge in the first place) and inspected back there. No signs of any leaks, rotting, or water damage whatsoever. I took off the panel behind the dinette seat back- again, no signs of any water damage. This is good news! But! I do see where the "perpendicular" walls are separating from the "parallel" walls. As was said above, because these are interior walls, I no longer think this is an issue of delamination. I think this is probably a two part problem of the newly installed floor boards shifting/crunching up on the walls causing them to buckle. And like bc bigfoot said, the issue of the cut out/inspection plate not being properly supported.
Since I believe I am about 99% sure of this diagnosis- I may opt to do the work myself as opposed to taking it into the shop. I may call and try to get an estimate just to weigh my options but don't feel like driving 2 hours and being Without my home for a few days just to have them quote me something outrageous.. It sounds like I have a pretty big job on my hands but I'm up for the challenge. Bc bigfoot- I may have more questions for you along the way as I prepare to (finally) get this issue taken care of.
Thank you everyone!!