
Just wanting to ask a few newbie questions about setting up my new flight cage correctly from the very start. My Gouldian pair are currently in a standard sized cage inside but my partner is re-purposing our old trophy cabinet to become a flight cage (i will include pics below). Since this is the biggest cage I have ever owned I am wanting to make sure its a good, safe environment for my babies. PS: The bottom isn't finished yet but it will be done in a very similar manner to the top.
(I'll number my questions so hopefully they are easier to read

1. I'm sure this gets asked all the time but how many birds will fit in my flight cage ? (1.4m long x 1.4m high x 0.6m wide). I used the bird calculator but it only allows for two measurements and i don't know which two to plug in.
2. The top and the bottom can be left separated or opened to make one big flight space. For two Gouldian pairs would it be better to separate them or let the four birds have the run of the whole thing?
3. Considering that I am wanting to get another pair. Would it be best to introduce them all the cage at once or place one pair in first (Ideally I would like to house two breeding pairs in this space even though I currently only own a single pair). I know placing them all into a new place at once will be scary, but if i introduce one pair first is there a chance of them becoming territorial of the new cage?
4. Where would be the best place for the nests considering i want to place two?
5. What are the best types of nests to use? (the rectangular box with a circular hole or a woven thatch type one?) I currently have a rectangular box but my birds don't like it

Sorry for being a pain and asking so many questions again. I bought my birds off a reputable breeder in the area but I don't want to bother them as they were selling their whole aviary to move overseas so unfortunately I don't have anyone to ask these questions

Thank you for your patience and your replies, they are all very appreciated
