+1 to the Vic Firth video suggestion. Also, there's an Australian drum magazine called Drum Scene ( www.drumscene.com.au
) that ran a cover story on Danny and gave a detailed breakdown of his kit, including the current Roto-tom set up.
That said, on Tool's website, there's a picture of what looks to be an even more recent pic with one Roto-tom in the center flanked by a new Wavedrum on the left and his original Wavedrum on the right.
hope that helps.