And after ordering a 10 gallon water tank from Amazon that showed up and looked like a quality tank, but didn't match the described dimensions at all. I am still waiting to hear back from the seller A1Customs. So I called Ronco, and Rich was able to expedite an order for me and in two days I had a 12 gallon tank that fit perfectly in my space at my door. I also had a 4" top inspection port that could also be used to fill the tank with jugs. the price was about half of that listed on there website.
With the Webasto in and wired it was time to make the fuel connection. So I dropped the fuel tank and added a pickup tube.
With a water tank it was time for some plumbing. I started by cutting the holes in the floor for the coolant lines going to the heat exchanger. I used 3/4" waterproof strain reliefs for the pass through. I used the same ones for the #2 wire coming in to the inverter and 1/2" for the 120v incoming wire.
Here is the start to the plumbing. 1/2" copper to connect silicone coolant lines under the van up to the heat exchanger in the van. I used 1/2" pex for water lines. The silver valve is a tempering valve to keep the hot water at a tame temperature.