I haven't seen any instructions yet. The one I made was four 2"x2" boards and four hinges, but I think the EMT conduit would be nicer. If you look through the thread you can see what folks are doing. It looks like four pieces of pipe, four rubber feet (like for metal chairs) and some cables with clamps to hold it together. Some people are using bolts instead, and most recently, a new thread is for a more portable version. You need a counterweight or tie-out to keep it stable. I have never used it indoors, but there are plenty of photos where people have. Not sure how this would compare to the version you were thinking about....just another idea.
Also, you can buy a lightweight version for $300 if that's in your price range. 12 feet might be pushing it though, the more I think about it.
The commercial tensahedron link is here http://www.tensaoutdoor.com/. I own one of these and it works well. I would say it is definitely worth consideration. I used it with a 8'9" hammock and an 11' hammock. I have set it up at not much more length than the 110" need for the ridgeline in my 11'.
I have what would be the tensa4. It is in production, but there is a lead time from what I understand.
Tensa4 is indeed in production, but demand currently exceeds supply, so there's a wait. We're working to ramp up production.
For DIY, there's not a single set of instructions because many ways to do it, and too many different budgets, available materials, and other priorities to please everybody. I think Daneaustin3's version on page 27 of the main tensahedron thread is pretty compelling in terms of simplicity and low cost. You could easily substitute 2x2's and finish them nice for more "furniture" appeal. The footprint is pretty tiny and central, so ideal for positioning on the diagonal of a small room. Because it's a "2-legged stool" prone to tipping before you learn how to avoid that, there's potential for wall or ceiling damage. Ask me how I know :-). Avoidable if you know what to watch out for...
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Tensa Outdoor, LLC, maker of the Tensa4, Tensa Solo, and Tensa Trekking Treez hammock stands: http://tensaoutdoor.com/
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