[Caymanboy]

What Strick says in entirely correct. The coring probably will absorb moisture over time. No matter what you use it should be properly sealed. I look at it in a different sense, weight to strenght ratio. That same hatch in wood or coring is probably a 30-50 difference, do that around the boat and it adds up. All comes down to how much you want to spend and how light you want it, Truth be told, if done properly, either way will outlast how long you or someone else will own the boat.