I have also looked into it. bye the time you bought materials and bearings (expensive) fidled getting them machined ect you would be nearly better off to buy one already done errol sells them for around the $500 mark as does noletch . Errols are camber only adjustment noltech adjust both caster and camber.
You could allways do the cheap and nasty thing and get the struts adjusted (bent) my stanza ones are done that way and give 2.5 degrees neg.
Cheers Andrew