I also got the front battery box installed. I'll tidy it up later as well after the car has passed inspection. In any case, it fits and holds all 25 of SE40AHA 40Ah cells with room to spare.
The spare space gets used for a couple of components. Mainly the main contactor and shunt for Ah counting. The battery cables from the rear battery box and the outgoing cables into the controller will go thru the four gland nuts in the upper right corner. Cycle Analyst wires and contactor relay wiring will come in from the left.
After swapping the Webasto for another at Toni's Takeover at no cost, I finally have a working heat setup. The pump from ebay also works as advertised. The tiny tank provides gasoline for longer than the batteries can carry, but not much. In any case I now have more heat than I'll ever need. Probably more than my daily diesel driver ever puts out. The Webasto control panel found a place in the dash as well. It was easy to attach it to the fuse box cover, so that's where it went. I won't be using the timing functions so it doesn't matter if the screen cannot be read well. The on/off button is still easy to access and the red lights which come on are also easy to see.