High current bus bars on PCB controlled with mosfet and Raspberry Pi
That's not a mosfet on a PCB.
That a mosfet bodged on some copper plates bolted to a pcb to demonstrate the low Rdson of the thing. They also bring it right up to max Tjunction with 200A.

Normally with these currents you're looking at SEMIPACK or similar which is meant for this. Browse the power modules from IXYS or SEMIKRON and find a suitable module for your use. Over a standard PCB 100 Amps is an expensive challenge.

Also note that you may have to take switching noise into account where a raspberry pi may function unexpectedly.