After studying your posts on these forums, I am fairly certain that you have the skill. The question is, whether you want to do something with it, or just keep discussing the topic ?
Honestly, I just don't need it, so I don't really feel the urge to create such a thing.If the solution was easy I would have probably done it even when not needing it, but in such case someone else would have already done it before me. The problem is that it doesn't seem so much straight forward. At the other hand providing feedback on the forum is easy - this I can do by the way of having another beer before sleep, nothing hard about it
Still I believe it can be done and since it can be done, someone will do it one day - it is just a matter of time.
But to design it well, you first need to define what kind of privacy this technology is supposed to target.
I mean you can identify a different kind of threads.
The first one is of course that all the internet traffic is recorded.
The second: that the peers with who you are sharing your transaction may (and surely will, after you launch the project) be malicious - e.g I can imagine a network of bots flooding the p2p system with many txs to themselves, just to learn about your transactions.
A third... probably also something.
But if you just want to do a "p2p CoinJoin", without caring about any of these things, then you might just as well look for people to share your tx with at IRC; you all make a joined tx and each party signs manually its part. There already is a software that can do it - not only mine, for what I know.