Originally Posted by BobTheFourth
Some questions for the OP - How did you cut the hole for the pump head? I assume a hole saw, then a dremel or drill to make notches for the screws? What size hole saw did you use?
I've uploaded the pattern for the March 809 pumphead cutout here:
March 809 Pump Bulkhead Cutout
I built a nearly identical pump box as the OP. I even store the cord inside in the same way (use a thinner cord!). I drilled an array of small holes on the sides of the box for some ventilation. I've never had an overheating issue in more than 2 years of use.