A place to start from might be Inferno.awk,cp, mk, 8c, mv and some other tools have been ported to windows for inferno. Check in /Nt/386/bin
There may be some subtle differences from plan9ports but I wander if there might not be some way of taking advantage of the similarities of both environments.
In fact I wander if some of the libs like libdraw could eventually be used by both.
