I'm very confused at the aluminum frame - it would have been far easier to just buy a $5 (?) piece of pine (or equivalent softwood) to make the back frame. The pine can also be customized with a handsaw. I guess I would have rather spent more money on the visible part (walnut planks instead of a used countertop?) than the invisible part.
Agree that the aluminium extrusion is not necessary to achieve the look. The other, more ambitious living room lamp that I had thought about first would have required it, so it was a good opportunity to try out this material anyway.
Based on the other comments, I see the unconventional design gets people riled up. Didn't know it was possible to build lamps in the wrong way, hahahaha.
And you've also learned something about aluminum extrusions!