Designing Kitchens and Bathrooms - Island base

My wife and I just finished installing porcelin tiles in our condo. Our condo is fairly small, so storage space is definitley needed. We want to put together some base cabinets from Home Depot and install them to make an island counter (the counter itself will be about 40" x 84"). This counter will also double as our kitchen table.
I am hearing different things on how I should build and install (secure) my base as well as to what materials I should use. For instance, someone said that I should be alright using liquid nails, while another said that the width may not need to be secured, while others said that I should definitley consider drilling through the (new) tiles to secure the base.
My questions to you folks are:
1. What a is the best way to build the base and with what materials?
2. What is your suggestion to secure the base?

DJnTJ,

Once your cabinets are all screwed together, you could use PL200 and just adhesively apply this to 2x4's that could be cut at each end of the cabinet. The 2x4's would be placed inside the end cabinets and then screw into this at the base, then install some basemolding. This allows for others to remove the island and leave the ceramic floor alone.

This is a large island so not knowing what you have for countertop, this may be acceptable. However, if needed, you could use a masonry bit for the tile and drill through the 2x's. Then use 2 long screws to attached to the subfloor (tht is if you have wood subfloors and not concrete. This is an option.

Hope this helps!

Thank you for your suggestions. We will probably be going with a solid surface countertop and possibly even laminate, depending on the cost, labor, and time considerations.
Unfortunately we do have SOLID concrete subflooring. This is the big dilemma. My wife is scared of cracking the NEW porcelin tiles so, are there any other (SAFER) ways to secure the base, or is drilling through them inevitable. If so, then what is the safest method and which bits should I be using?
TJ

84" long is 7 feet. Cabinets are 24" deep and are typically used as a base for an island. An over hang with a 36" slab on top of 24" deep cabinets will leave you with 11" standard for the overhang. So, you are looking at a lineup of 7' of cabinets and a 36" slab if you want an overhang for bar stools. Consider the traffic pattern behind the bar. If you have a doorway and if area behind bar is a major traffic pattern, you will need at least 48" for passage. Consider, too, the opening of any appliances and the placement of the island. You will need clearance. If no oven or dishwasher doors open between island and those appliances, then you may get away with as little as 36". Whether or not the island is secured to the floor is your choice. It is doubtful that a 7' island is moveable or scootable. It can, of course, be secured to floor with masonry screws into ceramic tile.

12" is the standard for overhang.

Drill/screw 2x4's through the grout lines if at all possible. Just inside the end panel of the cabinet. You can use Tapcon screws for concrete to secure them. A hammer drill will help drilling into the concrete, so you have to be very carful around the tiles. Then, as Doug stated, screw the end panels to the 2x4's, and install base molding to cover the screws.

Grout is easier to fix than replacing cracked porcelan tiles.