I have the ark, i love it but it is'nt accurate by a long shot. Never got the idol, but am happy with what i picked up anyway from the fan made props floating out there.
Also, the chalice is really cool, and works for my display. But, its an artists interpretation of the prop and is fairly different from the real thing.
Theres a talented guy on the rpf and club obi-wan making an awesome idol that will have moving glass eyes and possibly sound effects built in to the pedestal, but would be expensive to buy obviously for most of us indy nuts