Look up aquarium drilless overflow by urajoey on YouTube... The overflow idea can be moded to fit your needs.
Thanks Danny! I've seen that YouTube user's videos. Some great DIY projects there.
I guess that the overall design is not too different from other DIY skimmers. I'm mostly curious about the acrylic fittings. Are they premade (I have been searching for them) or custom bent.
I'd also like to know where the white inlet strainer came from. Anyone recognize the brand?