Just some more clarification...
The fan behind the pumps will blow the air out of the case, cooling the pumps a little, so they will (I hope so) add less to the water...
The pumps will ofcourse be in the same level, side to side, not like I draw it on the pic (that was only for adding some crappy 3rd dimension)...
If I build the res, the two pump inlets will be separated by piece of plexy in some (1/3 I think) length to prevent them "stealing" the water on the inlet holes from eachother...
Flow indicator is optional...I like it, but will not insist on it, except if I manage to make it flow METER, that's another story...
Got no more ideas for now...got headache...should I go to sleep or light just one more cigarette and stay a little bit more here...hmmm, the question is now...