Well I do not have the skills to design such a system but thankfully there are specs around for various components that can be fashioned into such a thing . Without that , I could not have found a way to make it work, trust me I tried. I had hoped to separate it from any ties to myself or illegal activity , but at the end of the day I started out wanting such a system for the drug scene and it is pretty impossible to separate myself from it at this point. I am confident that it will be used by enough people who need such a system, that it will not be restricted to the drug scene that uses it, and thus it will hopefully not have such a limited crowd with which to gain more benefits from mixing/PIR than Tor already can provide (after all if only drug scene uses it, it is suspicious in itself if it is used). Currently I have figured out how to fashion it together and I am satisfied that it will scale to forums and be secure if properly implemented, now I am just pounding away at it trying to get it finished and ready for auditing, the design is stable and extremely unlikely to change further (and is not related to any attempts I had before at this, or made by me for that matter, because I do not have such leet skills  , thankfully I do not have to ) .