05-21-2013, 07:56 AM
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Sounds like a good plan, please post some pics as you build it!
The short answer is certainly you can run it without using an overflow, since the pipe you plan to use is an overflow BUT....
There are two points that, just in case you haven't considered yet, you should think about:
1) Make absolutely certain that the sump is large enough to take the "power-off drain down volume" and don't forget the watch where the return flow pipe is located. Make it higher than the outflow to prevent a back-siphon that way during a power failure.
2) You probably want to leave the top of the PVC open. Why? Those holes could get clogged over time or from debris. While it's not a visually perfect solution, might I suggest drilling some good-size holes in the PVC overflow tube, leave the top uncapped in case of clogs, and then wrap the "holey" portion of the overflow PVC pipe with the coarse foam (called "reticulated" foam by sponge filter makers). The foam should reduce clogging, be easy to remove and clean weekly, and the open top pipe gives you an emergency overflow should the holes or foam clog up.