I have updated the nix page and the sources at sources.lsub.org for nix to include the mark iv kernel.
The kernel is still work in progress, but now you can take a look and perhaps borrow bits from it. btw, the 9n kernel close to the nix directory/tar ball, is a modified 9 kernel that includes some interesting bits from previous incarnations of the mark iv. The mark iv should work with a std. plan 9, but perhaps for a few bits easy to spot and change. it's under the plan 9 license so we don't have to think much regarding how to distribute the bits without violating any license. we'll be updating the sources there as soon as we add new features or fix bugs in there. But don't hold your breath. hth
