Ok, I have to admit, I confused the B24 with the B25, and was assuming you were setting up a twin. NOW, realizing my mistake, and the fact that you're building a quad motor plane, you will need to divide the targeted wattage requirements by 4, not 2. Everything else still applies though.
You will also need 4 speed controllers also, one for each motor. You will then have to decide how many batteries you want to run, 1, 2, or 4. You can run 1 large pack for all 4 motors, you can pair inboard and outboard motors on 1 pack/pair, or you can run 1 battery for each motor.
Alot of 4 motor builders like to run the inboard motors together, and the outbord motors together. That way, if you have a power failure on 1 pair, you still have motors on both wings that work. It will mainly depend on how much room you have for batteries, and where you plan on putting your access covers.
One of the biggest challenges to converting a fuel powered plane to electric is this very problem, as fuel planes aren't designed to have battery hatches. If there's room in the Nacells, you can put the batteries there, but will most likely have to go in the fuselage. Make sure you extend the motor to ESC wires, not recommended to extend the battery to ESC wires.

Sorry for my confusion .