What do you mean by sealed? The top? Different sump compartments are nice, but can be a hindrance since the sizes are fixed. Something to consider. Also, how will you minimize bubbles getting back to tank....youll need bubble traps.
Last, my biggest sump issues have been moisture in the stand and mold, so provide ventilation.
Last, my biggest sump issues have been moisture in the stand and mold, so provide ventilation.