Nevermind...what i posted a second ago...
Looks like a Fuge sump design.... is that what you wanted to do??
Far right wall isn't necessary and that 14" wall doesn't have to reach to the top of the sump...may want to have a spill over wall for the times that the foam block plugs up and flow is so restricted you would want the spill over to get over to the pump side...just a thought.