Sump design is pretty much standard. You might want to take note of the height of the sump and consider if you want to remove any of the equipment for maintenance, you should have enough maneuver space. I am not familiar with the dimensions of the equipment you have listed but you should allow for 10%-20% buffer space just in case.
Another thing you might want to take note is the size of the return pump compartment. You won't want to make it too small as the water level will drop too fast due to evaporation. I see that you have catered for auto top up, but that is still some work if you need to refill the auto top up frequently.
Personally I would opt for a larger sump, as much space my cabinet can accommodate.