I didn't have to do a lot of straightening on these panels which is unusual. A very gentle tug and they were good to trim.
I decided one Thursday morning I was putting a "do not disturb" sign on the sewing room door and putting this together.
I joined the three panels in record time and they were spot on when I was done. I was so pleased with myself and the designer and the manufacturer who is Northcott, by the way.
The top and bottom green final borders were cut 1" to finish at 1/2". Just enough to separate the two grey pieces.
Here's a close up of the borders............