Take your exact dimensioned drawing to a couple of fabricators and see if they can do it without a seam. (If they can't, I'd redesign so that a seamless island top can be achieved one way or another.) Good luck!

The laminate of yesteryear would mean a seam. Now they can do some pretty incredible things. Check with the fabricators to see what can be done with your measurements to avoid a seam. If you have to, reduce the size of the counter to fit the requirements for "seamless".

Good for you on laminate; as mentioned above the world doesn't end and it is such a practical and pretty choice. I have it on my perimeter cabinets and Hubs laid granite 12 x 12 square on our 7 x 5 island; a realy job! Good luck and have fun!

The widest that any post formed top comes in is 42". Wider than that is a custom fabrication, which will be almost as much, or more, than a basic granite, unless you yourself can fabricate the tops. Granite can be had for around $32 a square foot.

Beyond that, your peninsula top design doesn't physically work with the needed support for an overhang unless you are planning on pilasters with corbels every 24" with full height cabinets with no drawers in between.

No post formed only done on site and 180 FX as fa as i know comes 5’ x 12’ so one piece for top

5'×8' is also a standard size. The only problem is that when most people say 5', they actually mean 61" or 62" with the overhang on the other side. You can get several edge profiles that will add maybe an inch to the overall dimension.

http://www.wilsonart.com/laminate-edge-options

And, you can usually make due with a little less.

Most fabricators I know understand how to make up to a 12" overhang without using brackets, unless you are planning to put a pole up there for "dances". A 1' cantilever off of 4' of cabinet is more than sufficient. After all, the granite industry just borrowed their method of overhangs with plywood underneath from the laminate industry.

Around here, a custom laminate top is still half the price of granite unless you want to get stuck with ubatuba-ugly or something pink.