The main thing is to ensure very wide tracks for the parts of the PCB that will carry the high current. There are some track width
calculators available via google that will help.
Some people also try tricks like fattening the tracks with solder (some schools of thought suggest not to rely on this because you
can't guarantee how thick the solder layer will be), or using both the top and bottom copper layer, with via holes to join them in
many places. Another way is to use fat wires as jumpers where you don't have the space for running large tracks.
This is all stuff from experience; real PCB designers may have better advice for a manufacturable design.
Also, make sure your connectors can handle it, or use soldered cables.
260W is quite manageable using the techniques listed above for the current carrying portions of the circuit.