Error Zimmermann

Hello! I have the following problem: After our carpenter finished the roof structure, we noticed that the joints on the visible formwork are not consistently even but there is a noticeable offset. Also, two roof windows did not fit because the opening was smaller than necessary. How can a solution be found here or what is appropriate???

You have agreed on something contractually - approach the carpenter and demand rectification. It should be possible with the window openings, right?! The effort for the joints will be too high, but what does the carpenter say about it?

Rework is not really possible, the roof is already covered. I had entered the wrong batten size into the CNC machine, so the openings were too small. The carpenter first tries to blame others...