I came home to a nice very small package last night.
Hooking up the water heater will likely be a breeze. There are really only 3 things to hook up, the cold water inlet, hot water outlet, and the electrical. It'll probably take me more time to make a mount for it than to actually hook it up.
Here are some pics. Soda can added for scale.
And we pop the cover open to see the guts. Really not too much in there, just the heating element and control board and a few sensors.