Thanks for all the info here at Chefsteps ++
My current setup involves two half buffet servers with lids. The lids are perfect for keeping in the heat, and leaves an opening for probes or even an external element.
I used two elements similar to the camco, but purchasable at Canadian tire for us Canucks. I've used the camco as well, but the nice thing about the ones here is that it comes with a square flange and nuts/bolts. 1500 Watt Each. Some silicon and a dremel and the metal is easy to cut, and the elements to insert. These elements also curve down a bit, so leaves more space for your sous vide bags to float.
Current challenge: Water circulation. I am looking at the home depot type fountain pumps 4-6GPH like other users here suggest. Bubblers don't seem to do much. I'm worried about the vegetable bath temps (175-195) burning the motor.
So far so good with the SSR relays. I've connected them to a box and outlet; this way I simply just plugin the water baths (or anything else for that matter) to the standard plug for control.
The braided wiring PT100 probes are holding up nicely. Had to return one as it was off (by a lot).
Other interesting notes: The SS nuts on the high temperature bath start to show rust quickly.
Washes off with no hard scrubbing. Any ideas to protect? Silicone? Nail polish?

Double PID controllers velcroed to platform, Double SSR, feeding single 110V box.
Each side of the plug wired to each PID. SS Braided PT100 probes. Half buffet servers.
Lid not shown. *RAISED* from the granite so as not to dissipate heat into the
stone. I formed a crack while cooking at high temp (doh). Lesson learned.
Happy Cooking and thanks for the view + any comments!
Shane Chagpar