This sounds amazing. No need to worry about copyright and asking permission. It’s all free.
Warning. The 3D files are huge and a .ply format?
After downloading one ply file that is 94mb and then 7zipped it, the size became 11mb. Saving it as a blend makes it 30 mb and 11mb 7zipped. Smithsonians should have made a script that zipped all these files instead of raw download.