Editing/creating moulds...

Ok, this one looks difficult(maybe i could b wrong)...

First of all i'd like to know the position of the 16 moulds used in the enemy formations, inside the hex code... after knowing that:

- I need to know how the rectangles are handled, the max space available in each mould, and how to calculate the space used from each enemy rectangle;

- The lines of code that makes you change the size of enemy rectangles;

- There's also something i've never figured out: Moulds 13, 14 and 15 doesn't have any rectangle, appearently...
Besides they never appear in any formation of the game, not even the dummied ones.
So... how do they work? are they useless/without rectangles?
In the case, if i want to create new rectangles on them and use that 3 new moulds... would that be possible? (without causing any glitch/freeze)


Does someone knows any information about that? That would be really helpful! thanks in any case