Well, I've come to the conclusion that you guys should build 'em, and I'll play 'em.
I won't tell you what went wrong yet until I see the finished product.
That doesn't sound fun for you. Let me take some wild guesses:
1. You decided to arch the back but only arched it lengthwise, thus making the uke look like a clog.
2. You made the neck V-shaped because that sounded cool, but it got really uncomfortable.
3. Top got too thin.
4. You bent one of the sides inside out.
5. You bent one of the sides backwards.
6. You cracked a side and made a sub par repair.
7. You ran a chisel through the top when shaping braces.
8. After closing the box, it seemed like a good idea to remove sawdust with the hoover, but the nozzle covered the soundhole and created a vacuum that made the back crack and cave in.
9. A big chunk of wood flew off the back of the neck while carving, and trying to save the situation you had to make the neck too slim.
10. Shape of body got all assymmetrical.
11. You decided upon an aluminium saddle and it sounded like poo. But you were too lazy to change it for two years.
12. You took orders you don't have time to honor.
13. Headstock got too short.
14. Tuner holes got too big.
15. Finish got dull instead of shiny.
16. Bridge slipped during gluing, and got slightly diagonal.
17. Glue got on the outside of the box but was invisble until finishing.
18. Frets got misplaced and wonky 'cause you don't have a jig.
19. Wife "hinted" you spend too much time building.
20.
Of course, all these mistakes and misfortunes are completely made up, and have no connection at all to my experiences during the early stages of my building. Surely, anyone who'd suffered through stuff like this wouldn't continue building, and not be approaching 40 instruments?
All you've shown in your pics look really really good. If you made some mistakes, don't be too hard on yourself, or your uke. You don't have to build ukes. But I can promise you it gets more and more fun, it gets easier, it gets to a point where you would never give it up.
All the best man.
Sven