Who Constructed the Noose/Gallows on 1/6?

Today is the one-year anniversary of the "worst terror attack since 9/11". It's very strange how nobody has ever found the perpetrators who constructed the noose and gallows in front of the Capitol. How were "Trump supporters" able to truck in the lumber and tools to construct it in such a secure area? Why is there no video footage of it being constructed and no photos of the suspects for us all to help identify the person(s) who wanted to "hang" Mike Pence for treason? Why is nobody in the mainstream media asking these questions? Why did it perfectly frame the Capitol for the benefit of mainstream media news photos?

What mystery is likely to be solved first this one or the disappearance of Tiffany Dover?