I believe I am ultimately Endomorphic (round) but due to being fairly active and not eating kebabs every night I hide it well. Wish I was naturally Mesomorphic, but hey ho!
just had a quick look at that link...i have read of this before from a much better source.
i say i am essentially an endomorph though not as shown in that link - i am not round, so perhaps i have some meso too.
as i recall, the main issue here is skeletal rather than weight, fat or muscle, as these can be altered by our behaviour, whereas your skeleton cannot.