OK I said I wouldn't post in here again, but I will break that promise to explicitly state that this is not development of an actual product. That's why I say this is technically an off-topic thread. I have zero intentions of doing the legwork for getting this made myself. There are no business ambitions in this project. If a brand approaches me to participate in a project, that's a different story, but I'd say the likelihood of that is slim to none and not really what I'm aiming for. I am doing this to learn and because I enjoy it. It does feel kinda conflicting that I both want to share my work and learnings with others but also giving out potentially valuable work out for free, but I'll get over it.
If I were to make a frame I wouldn't want to build internal frame storage, but I'd 100% design a several different Timemachine Road and Triathlon-esque storage solutions and if they weren't made available for sale, I'd share the .stl files publicly.
Also V3 post is up now.