Tom, I think John Balderston's November 25 report documents "major airframe" components: engine mount, right wing, etc. I don't know if this has been made accessible to the Forum yet. I would assume the cockpit, with instrument panels, as well as a landing gear, also count as major components.
In the end, logic dictates that only one certifiably NR16020 part need be identified to prove the Nikumaroro Hypothosis. Naysayers, on the other hand, must be able to demonstrate that EVERYTHING asserted to be a part of this aircraft, MUST be something else instead. I am betting on the liklihood of the first.
Ric maintains that TIGHAR's agreement with Kiribati already covers the right to examine and recover both airplane and human remains. The question you pose, nonetheless, I infer to include a more profound component: even if legally recoverable, is it morally and ethically permissible to disturb a gravesite? I would hope that Father Moleski could help us out on this one.