I just finised a job for a customer that didn't want to use a solid surface top on their outdoor kitchen (BBQ island). It became a real dilemma. No one wanted to touch the job except for moi.
What I did was use 2 layers of 3/4" pressure treated plywood screwed together and glued together with PL Premium.
I first installed PT 2x4 framing inside the island flush to the top in order to support the ply top and have a surface to screw it down into.
I also had 3/4" thick streel L brackets made for where it hung over the rounded side as my support.
I then troweled on a good quality thinset to the top of the ACQ ply and screwed down 1/2" Wonderboard..
Over the Wonderboard I painted on two coats of RedGard waterproofing and crack resisting membrane.
Over that I installed my tile.
The heavy edge tiles I used Speedset thinset which dried pretty rapidly.
The edge tiles I had supported on 2x4's clamped under the counter till it dried which took about 30min +-
The link below works really nicely using the SLIDE SHOW FEATURE..it's towards the top left of the pictures once you click on the link.You can pause the pictures too if you want. It shows ALL the progress right to the finished product. I posted some stills here as well.
http://picasaweb.google.com/andybuildz/BBQTILETOP <--for the Slide Show