I'm designing my rig after yours, but I'd like to use the xspc res tops. (thanks to Martinm210, and his excellent work)

PIC

2 things, the pump's outlet is slightly at an angle, and i doubt that it will screw in. Second, I don't know if the added water weight would cause the acrylic to bust.

Also, I'd have to put the barbs at the bottom, to allow the top inlet to be accessed. (guess holes and tubes comeing out and back in at the top of the case would work too.)