Yesterday, I ran a "common" wire from my common terminal strip to the shelf where my (eventual) Base3 will reside, as well as a PDI cable from my SER2 to the same shelf.
While it will likely be several months, all I will need to do will be to plug in power, attach the common wire, and start running my layout with the Base3!
How's that for positive thinking!
That's "Little Stevie" under the soon to be Base3 shelf BTW, LOL!