Rylan uses lights, but does not build a tower
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Rylan found some fairy lights, which he attached to the top of the bio-dome so they would hang down onto the scales and still be taller than a wolf. Despite arguing that he had made a tower, light in both weight and luminosity, Greg judged that Rylan did not build a tower, disqualifying him from the task.
(Written by Taskmaster Wiki contributors)