How difficult would it be to make a "finished" flat pack? The parts could all be painted or veneered and any fasteners could be hidden using knock-in plugs. Most Ikea stuff comes like that.
After assembly, Jay's H-Frames are FAR more solid than Ikea bookcases. That locking cam system is seriously lacking, not nearly good enough for quality subwoofer cabinet applications. The H-Frames are very easy to put together, really well designed and made, and REALLY stiff and non-resonant. Getting them professionally painted or veneered shouldn't be difficult or too expensive. Well worth it for the State-Of-The-Art Gr Research OB/Dipole Subwoofers!