how to install an undermount sink in two pieces

Hey Guys

I have a really long sink run (164") that i need to do in two pieces with a seam at the center of the undermount sink.

The Material (http://g654.org) is 3cm baltic brown.

Simple question is: how do I do it?

With 3cm I always rod at the shop when there is a single piece but I have only enCounter (http://GialloFiorito.com) ed a really long run with 2cm w/lam and (http://maplered.com) that was on a subtop so it didnt really matter.

So where do I rod? How will the sink in two pieces be strong enough to carry the sink (even though I will be using mechanical fasteners of some kind)

Thanks in advance