Wife wanted to build a new hobby station in the front room of the house to hold all her craft items and give her a good sized counter area to work. Previously, she would have to use the kitchen table for larger projects, and could only use one machine at a time.
She measured and made her plans, bought the materials and started work. I initially stayed out of it as she wanted to work on it herself, but about halfway in she found (as I did years ago) that working with a 150 yr/old home and previous owners who couldnt read a tape measure, let alone a damn level, makes any modern construction project a pain and she was getting very frustrated. So, I got involved.
Had to get her to understand that even though her plans were excellent, she had to somehow tie the sides to the countertop and backsplash to make a solid foundation which would strengthen the entire assembly, then had to explain why an 8ft countertop and shelves will sag if not supported thru the middle, so had to adapt her plans to all that.
But everything turned out nicely in the end, and I havent seen her that happy in a while. This also gave her reason to repaint the room and install new blinds, so we got those two jobs out of the way, too.