Good video, easy to follow.

An excellent demo video

I found this useful but could be a lot better. Have you ever been to a lecture or an in-house demonstration where they have background music. There is a reason for this. There should be more information about fitting a shelf as you cannot fit it after the assembly. You will need an extra 2 screws per glazing bar. The guy started to explain this but got bored. There is no mention of how you deal with having the bracket at the end of the side and how this needs to be fixed to the corner piece. 6/10