why not "Such a throat is practical." ?
also - why would anyone ever say either?
http://en.wikipedia.org/wiki/Giraffe what a nice neck!
'Hals' also translates to 'throat' although 'throat' is more often identified with 'Kehle'
A long neck is very practical for the guillotine. Only in very specific contexts it is not grammatically correct nonsense.
Giraffes do not agree:)
@flis333: That's fine in British English. Please report it if it's not accepted.