Thanks grover959. What's nice about this, is the tiles can be lifted out of the way and have access into the ceiling. For the ceiling panels I had a bunch of these 4x8 sheets of a homasote type of board with a textured coating on one side. My dad had a bunch left from the 80's. I don't think they make it anymore. I had a leak and had to replace a couple and for those, I used white tile board (home depot model# HDDPTW48 internet # 205995949) it's ready to use and it looks really good. An idea that I really like is to use model# 538281 internet# 100080170 (home depot) which is a plybead panel I was thing of leaving it natural with poly on them or maybe a really light stain to get a nice contrast. Also, they sell plybead panel that is the white which i think would look good as well. Hope this helped you some and sorry for the long reply. If you have anymore questions just let me know.
This is a really nice cabinet. I like the contrast between the stained wood and painted body of the cabinet. Love the plank top with the bread board ends. Would love to see pictures of how it was built. Great Job!