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Tricky one as it seems like you're both on a learning curve. If you are making good the holes and paint then his part of the job is relatively small. From the tradesman point of view the making good of holes I've just drilled would be my biggest concern. You could try being conciliatory, offering to make the holes good and asking how much extra it's going to cost to put right. Only you know the details of the original discussion though.
Hard for me to answer really as I'd put it right myself overnight and put it down to experience or pay I guess.
When I'm instructing people on works I always provide detailed plans with mm perfect measurements, probably seems uptight but it saves these sort of problems.
Also in agreement with Aunt_Maud that the layout should be marked on the walls for approval if plans don't exist.
Well we discussed it, I said I wanted them to start level with the bottom of the mirror. He said they’d be spaced out from the top suggesting working down instead of up. I agreed to trust his judgement.
So I’d agree with you to some extent but the top shelf at 2.3m doesn’t seem very practical. So I’m not sure this is solely my responsibility?
I’d be interested to here the perspective of any carpenters or trade people here.