Hello peha,
Yes, it's usually something like that, but the links to the chunk elements are usually stored in the /0/0/frame.zip/doc.xml file, so if you are removing anything from the the .files folder, you should also fix the mentioned doc.xml file by removing the corresponding lines, otherwise the project wouldn't open.
Unless I'm mistaken, there are no links to the orthorectified images, but there are for the depth maps and thumbnails.