Hut Capacities

Hi there.
I'm walking the Overland again in Feb 2012, and was just doing some reading on the parks website.
I find it interesting that some of the hut capacities seem vastly different to what I would imagine based on what I can remember from last time/photos of the huts. Does any one here know what sort of system is used for determining the hut sleeping capacity (ie someone who works for Parks, is there a numerical way this is calculated?)
A few examples:
1. It just seemed strange to me that Pelion was listed as 36 people, but Chapman says 60. I'd have said at least 60, probably 72
2. Bert Nichols - the new hut is listed as holding 24??? I'd have said at least 48, it's not in my Chapman book
3. Lake Vera - parks say 20, but it is at least as big as Waterfall Valley (probably a bit bigger) and parks say 24 at Waterfall Valley, so why not the same or more?
4. Tahune - Parks say 16, but I'd say 20 comfortably.
The only other thing I can think of is that the physical sleeping area available isn't the only thing which is used to determine capacity. Maybe there are other regulations (for example like ventilation of the sleeping areas) which are more restrictive and prohibit Parks from advertising the sleeping capacity purely based on bunk surface area.
Any ideas? Tastrax?
I'm walking the Overland again in Feb 2012, and was just doing some reading on the parks website.
I find it interesting that some of the hut capacities seem vastly different to what I would imagine based on what I can remember from last time/photos of the huts. Does any one here know what sort of system is used for determining the hut sleeping capacity (ie someone who works for Parks, is there a numerical way this is calculated?)
A few examples:
1. It just seemed strange to me that Pelion was listed as 36 people, but Chapman says 60. I'd have said at least 60, probably 72
2. Bert Nichols - the new hut is listed as holding 24??? I'd have said at least 48, it's not in my Chapman book
3. Lake Vera - parks say 20, but it is at least as big as Waterfall Valley (probably a bit bigger) and parks say 24 at Waterfall Valley, so why not the same or more?
4. Tahune - Parks say 16, but I'd say 20 comfortably.
The only other thing I can think of is that the physical sleeping area available isn't the only thing which is used to determine capacity. Maybe there are other regulations (for example like ventilation of the sleeping areas) which are more restrictive and prohibit Parks from advertising the sleeping capacity purely based on bunk surface area.
Any ideas? Tastrax?