I placed the Mark III version in the car for a test fit.
First task was to mark the location for the mounting hole and drill it.
Then I just loosely placed the components on the board to test the layout.
You may have noticed I'm using a quick disconnect for the power and ground. (and for the other connections too. more on that later.)
Here's a link to the disconnects on Amazon.
https://www.amazon.com/gp/product/B01KHQR0K4/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
You crimp the supplied ends onto 4AWG wire and then insert the crimped ends into the connector until they click in place. This would have been A LOT easier with a hydraulic crimper but I don't have one of those so I just had to crab up on it.
These are rated up to 175A which is plenty. The amp is fused as 2 x 30A for a total of 60A.
These also come with plugs for capping off the ends when not in use.