Measure your island and add an extra inch on every side for the overhang.
Purchase a solid wood block such as maple or oak from a home repair center. Have the block cut to your specified size.
Purchase a 16-gauge stainless steel sheet from a local steel distributor and also have it cut to size.
Position the wood block onto your island cabinetry. Secure it in place with L brackets positioned on the inside corners. Make sure the screws you are using are at least 1/4 inch shorter than the solid wood block.
Set the steel sheet onto the top of the wood block.
Secure the sheet down with the metal table edging. The edging has a groove that holds the stainless steel in place and another that clasps onto the wood.
Secure the edging with nails placed every 6 inches.