well the 24 frets throws off the
neck pickup's placement a little bit if your bulding a guitar that is designed to have a 24 fret neck , i am not sure exactly if you could do it because not only does the neck lenth matter but also the position of the bridge . if the guitar your putting a neck on had a 22 fret neck and your trying to put a 24 on it , it wont work . you'll either end up with a longer scale or the neck will hang over the neck pickup .