Tutorial to add outlets / buttons to dash slots

Sorry to ask because I'm sure there's a tutorial I just haven't found the right search terms for.

I have a lithium camper battery / power system I set up in the back of the cab and a circuit for some accessories in the cab. Specifically, USB and 12 volt outlets that run off the system plus controls for some PC fans to move air around the chargers and inverter. Those are currently just sitting behind my seat, and I want to mount the outlets and fan control in the center of the dash below the head unit.

So I guess I will put a new blue sea fuse box behind the kick panel, and run wires behind the dash, and then cut holes in some of those blanks to pop my round 12 volt and USB outlets into?

Can you guys point me towards tutorials for this stuff?

eta: I know how to run my wires to the kickplate area. Not sure of best location for the fuse box, and not sure how to fit a round outlet in a rectangular blank, or best way to run the wires to the switch area without tearing out the dash.