I talked to someone at the school involved with the show and apparently it has changed very much since its initial showings in 05 and at NYU and even since they received the piece in November
Galt and Matty have been actively working on the score/book in which the cast have received numerous scripts.
Temms- apparently the scores great and has MacDermots sound all over it, similar to HAIR! Also like you said- his music is written separately from the book after lyrics are given to him
From what I hear its not only Lysistrata now but also incorporated is Greek mythology of the Gods - most specifically Hades and Persephone
Also it looks like its going to be a full production which it hasn't received yet
And movement master Keri Margolis is largely involved - but isnt credited?
They sent me a link to the artwork which seems very much like some of the old HAIR tarot card artworks