Thank you both for your responses.
I have since read two of your papers, which give me a better idea of what your project's specific directions may be. Previously I had read only your "about" page, which currently talks only vaguely about curating one's personal data. Would it be possible for you to add a link to a more detailed definition of the project, please?
I agree that the implementation architecture is merely an enabler, and will evolve. The "box" metaphor just happens to suit both (and only as a first approximation), but their physical similarity is incidental.
It is the potential cross-fertilisation of goals and exploration of ways to move forward from the increasing silo lock-in that motivates me. My goal here is just to help make sure any useful opportunities are not missed. (I am interested as someone who wants to use, and would like to participate in the development of, open web technology in general.)
While the focus of the IndieBox itself is largely on providing open alternatives to silo-dominated services, which I understand is not your goal, the IndieWeb group behind it is active in two areas that may be more relevant. First, creating and promoting the open protocols that support such services. Some of these are being formalized as standards, e.g. Microformats. It seems to me the databox project will require development of open protocols.
Secondly, promotion and outreach, including looking for ways to induce the big players to change their strategy. From what I have read, it appears you will be looking at incentives as one of the main themes. I imagine that will be hugely important.
Thank you, and best wishes for the presentation and activities at MozFest this weekend.