WyoTraveler wrote:
I had the same problem with lower cupboard floors.1/8" or less. Had to be bent to be removed. However, useless with such thin plywood. I used 1/2" plywood and installed in sections. May want to do that with your bunks. I reinforced framing also. If you take a drawer into a paint store you can get stain mixed to match just like paint. I took a sample of plywood I planned on using and they matched it very well. I went to Sherman Williams paint store but I'm sure they can all do it.
No appearance issues, since the lower bunk wood is under a mattress and not visible.
I might not even worry about the upper bunk, since I doubt that it will be used much.