mayor10: If I were to build a DIY PVC skimmer it would definitely be recirculating simply because it doesn't cost but a few dollars extra for some plumbing and another couple uniseals. I would be able to get the skimmer out of the sump and make more room for the refugium. Also, I would be able to directly feed it from the drain bringing the dirtiest water right to the skimmer.
The only recirc skimmer from octopus comparable is
this which is much more pricey. I appreciate the input though.