A warped 1 5/8" cast iron top, I cannot imagine how that would happen! The problem that I see with using wood, or MDF or plywood is that a tip that big will need to be supported somehow. I am sure someone will be along that has had experience in this area.
Wisdom: Where experience and knowledge combine and become one.
"We are all one decision away from Stupid!!"
"How often we sacrifice the permanent plans of God on the altar of immediate solutions"
I have a very good memory, just short is all.