Have a look at the mothership, it does the same using data requirements. I am sure you can get the number of hatcheries in those requirements as well (current mothership requirement is like number of motherships ==0, you will make number of queens <= number of hatcheries +1)
Have a look at the mothership, it does the same using data requirements. I am sure you can get the number of hatcheries in those requirements as well (current mothership requirement is like number of motherships ==0, you will make number of queens <= number of hatcheries +1)
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Button requirements are purely visual, you have to apply the requirement for the build ability or you can still build the queen.