Green cheek conures need 1/2" to 5/8" bar spacing. 3/4" is a danger. So I'd say 1/2" to 3/4" depending on species of conure. You can included a footnote to specify which species can safely live in a cage with 3/4".
I'd make your measurements either all imperial or all metric. Right now you have a mix.
And I'd include some info about hours of light vs dark and the dangers of happy huts.