It can be done, for any even number of statorpoles, using 3 identical stators, Herbert Kabi's 'Trio' design:
http://www.rcgroups.com/forums/showthread.php?t=249953
And search for Herbert's contributions here:
www.yahoogroups.com/group/lrk-torquemax Vriendelijke groeten ;) Ron van Sommeren
brushless motor building tips & tricks
diy brushless motor discussion group
Drive Calculator download & discussion group