there is an ayahuasca website
www.ayahuasca.com hosted on
www.yage.net ...
your doses are about right; how to prep 'em into a "palatable" brew is something else... rue & mhrb ayalog can be pretty yucky...
it's fairly easy to extract the rue seeds into a pretty crystal pile... (using vinegar & salt --- yields mostly harmine & harmaline hydrochloride) & thus much of the less desirable chems are eliminated...
as for the mhrb, an acidic simmer, filtration, & then allowing the brew to settle overnight & carefully decanting the burgundy liquid (leaving behind the sediment) may help overcome some of the irritating tannins...
but g.i. upset is still a distinct possibility...
visit the aya forums for plenty more info, mmkay?