Nikos_Greek wrote: ↑Wed Oct 10, 2018 8:13 am
Neck profile can be a huge issue for some people. ...
Except builders.

In the classical guitar world there is very little discussion about
neck profiles and the terminology "C" and "D" are scarcely every used. I have only heard of necks as being "thinner" or "thicker". If you gave me a guitar and asked if it was c or d I would have difficulty - I don't really know what this refers to. I wonder if it is more US concept? Something for the workers in the big box stores to differentiate between different steel string
neck profiles?
On the forum here there are rarely discussion about necks, just occasional side comments, so I suspect most players don't care all that much about it or maybe most guitars have basically very similar profiles. The only time I can recall noticing a profile is on a 1984 Granada guitar with long scale and 54mm nut. It "feels" wider and "flatter" but I can say if someone would call it c or d. I quite liked it.
I have 15-20 plans and I can only recall one off-hand that shows a
neck profile but I can't say if it is c or d as I don't really understand the concept. Single builders and small workshops build whatever the are used to and I suspect that they mainly think about stability. For a small builder, they set up the
neck carving machine and thats it. For a single builder the
neck shape is not an issue, it can be anyway the client wants it. So long as the general direction is "less" and there is enough "meat" it is also very easy to reshape a
neck. Adding wood is not easy. Refinishing the is an "it depends" type of question. So often changing guitars might be better.
As an amateur every
neck I
shape is different. I do it by feel. I tend to have relatively thick necks on my guitars so that reshaping them would relatively easy. It is semi-intentional based on the logic that wood is easy to remove and difficult to put back. Curiously one of my "to do" items at the moment is to copy the profile from the only plan I have with a
neck profile (A Santos) and to try that on a current build.
If there was a common terminology and some
neck standards, it would be interesting to find out what people prefer but for the moment I think the terminology is too vague. Maybe some dealers have an insight into it.
Edit.
My teacher who has lived from guitar teaching and playing for 40+ years said that a concert player practicing 4-10 hours a day will mostly likely prefer a somewhat thicker
neck. In his view the thinner
neck is more likely to cause injury when someone is practicing that amount. However, profile
shape was not mentioned.