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If there's a 3cm air gap, why don't they just go in from the top/bottom/sides?

And did they really drill holes in Vasari's fresco, or just use a neutron thingy, like the NY Times articles says? If there are holes, can't they just shove a small camera inside?

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For a more technical treatise ( and additional information ) on what was done, check out this press release: http://calit2.net/newsroom/release.php?id=1967

They did drill holes, however they were tiny and in places that were undergoing restoration. The holes were even drilled in the presence and under the supervision of the people who were doing the restorations.

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