akoly, I would switch the pump side to the other side. You'll put less stress on the pump by doing a straight vertical piping rather than having 2 extra elbows and 3' extra feet of return line.
That is of course, if you can. I see you had the drain line on the other side, which may block that. (I'm sure you have thought about that.)
nevermind, i see that they have installed a drain there in the pics. That was not a very good design move IMO because it puts more head pressure on the pumps.