I consider this overkill for a darkroom. Instead of the sidepanels U-profiles would be sufficient.
(As a side note: I wonder about people bothered at sleeping rooms by slight leaks in window blinds. I myself sleep under a roof slanted window without even any blinds.)
Quite! I've got some very basic U-profiles on some of my darkroom windows which do the job and I am just about to install some long magnetic strips onto the blackout curtain on my main entrance to speed things up there, for when I go in and out.
And I agree with amount of work being done. I was cringing at how much work she was doing. It was nice work but not the average project for a novice diy-er.
And I too sleep with out curtains closed and love waking up to the natural light. I too can't believe people who complain about a pin prick of light coming through a curtain whilst sleeping!
My budget has demanded that I buy thick, black plastic sheeting which is wrapped around cardboard inserts which fit perfectly into every window frame. And, as AgX wisely put it: this is 'overkill'. - David Lyga
Very similar to what I did in my last house David, when I had to convert my bedroom easily when I wanted to work in it. It was a simple solution and worked a treat! The frames often stayed up for days at a time, when I was doing a long session. I'm sure some of the neighbours wondered what was going on, that the windows had to be blacked out for days at a time by black plastic.
Terry S