It seems to me that regardless of the simplicity they still have to punch holes in, at least, the outer skin of the building and as
@marni1971 hopes that they didn't punch through the inner membrane that keeps the interior dry. The only way they could avoid punching through the outer structure is if they crazy glue the lights to the structure and run the wires in the seams of the shell and have one giant toggle switch on the ground outside. So it is true that it is "seamless" but it has hundreds of holes drilled through the shell. Imagine drilling hundred of holes in your roof at home, and then spending the rest of your natural life patching up the spots that for some reason or the other were overlooked at the time and were missed in the sealing process.