I made a couple of small errors but dammit I did it. I bought it for my birthday almost a month ago, to see if I had the dexterity in my addled hands and brain, and the answer is, I do!
No art pictures on these, I just built a predesigned wooden model kit, no real creativity, just instructions and endless dexterity rolls.
These things in particular are meant to serve as book shelf ends/spacers/ organizers to help keep things on your shelf upright. If your bookshelf is already full then I guess it wouldn’t have much use unless you remove objects.