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Full disclosure; I decided the same thing. I designed it but had a local professional build the tank. He makes high end acrylic furniture for wealthy clients. And custom tanks and gadgets for me and my aquarium clients.
The guy that built the tank has a few hundred thousand invested in acrylic working equipment and decades of experience. Yeah, with time and equipment, I could probably have made something and it would work (hold water, do the job) but it wouldn't look like the professional job that it is. Sometimes it is best to go with experts; I got exactly what I wanted and it looks fantastic.
This tank is intended for cuttlefish eggs and grow outs. I'm focusing on importing and aquaculture right now which for me are *much* better options than collecting/purchasing, housing and shipping individual wild caught octopuses. I don't have any special local octopus sources. Where I used to collect 30 years ago, under the Blue Heron bridge, is now protected and besides, Octogirl does her research there.
I do have contacts with some of the best aquarium wholesale importers in the business.
Perhaps sometime down the road, I'll work with locally sourced Caribbean Reef Octopuses eggs and hatchlings again. And or design and have built a custom octopus tank.
Lots of balls in the air right now. This is my "play tank".