I too would like to see clear rules about this. Main problem is that we look for something consistent more or less related to LEGO numbering scheme when this one is NOT consistent...
Things are even more muddy when you add printed parts in the scheme, eg. there is only one design number for the cow assembly with different patterns (64652) and 3 cockpits 8x16x5 design numbers according to pattern.
Things are even more muddy when you add printed parts in the scheme, eg. there is only one design number for the cow assembly with different patterns (64652) and 3 cockpits 8x16x5 design numbers according to pattern.