Most of the frustration is the part that it wouldn't have cost them one single penny more to do it right.
I provided them with all the drawings, measurements, pics etc.
For example the pickguard. I gave them a drawing. All they had to do is put the file in their CNC machine and cut them out.
Now they've designed their own pickguard. Somebody spent unnecessary time on that.
It would've been cheaper to use mine. With better result!