What do you mean by "demanding"...to build? If there is any concavity in the sections they will be very demanding to build.

I think the accuracy limit of a home builder in terms of section shape would only be in the order of 0.5mm, even 1mm deviations from the exact shape wouldn't be uncommon I suspect. It's difficult to achieve close to exact shapes without a very expensive construction method, which would be beyond most home builders.

On the other hand, it is very easy to achieve close to perfect fairness with patience and attention to detail.

What I'm trying to say is try and get the section shape close but don't be too pedantic with it, spend more of your time fairing as perfectly as you can with a good torture board.