Makes perfect sense. I've done the same thing with sewing patterns, jumped straight to the fun fabric choices and then realized I had no idea how the armholes were supposed to line up. A checklist stops you from having to backtrack and fix your own mess later.

Oh, you're describing my brother to a T. He designed his fishing club's newsletter with yellow text on a white background because it matched their logo, and I couldn't read a single word. I finally printed it out in black ink and handed it back to him. Some people just don't get that if you can't see it, the design doesn't matter one bit.

@river183 beat me to it, but honestly the real killer here is that 3 degree thing. It's like when you're off by just a little on a miter cut and suddenly your whole corner looks crooked and you can't unsee it. Hope your buddy Mark buys the next round for all the grief he gave you.

Wait, did they teach you how to read those tiny markings on the scale ruler right away, or did it take a while to figure out? I mean, when I first tried using one I kept mixing up the different scales and it was a mess.

Did the client actually try dragging boxes around in your numbered grid before you switched?