adamfromsubway
I am familiar with that cage and with the cage calculator. IMHO that cage calculator is heavily biased towards breeding situations and fails to give height an adequate consideration.
Yes, finches need side-to-side space for flight, but they can and will use the height of a cage too.
I would have no problem putting 8 to 10 societies in that cage, or 6 to 8 zebras. Higher numbers obviously a bit riskier with the zebras but it would be possible with a compatible flock. You are more likely to have to sort things with Zebras than Societies.
Gouldians - not so sure about their temperament. I thought they were fairly peaceable birds, at least when NOT breeding, but I've never kept any or been around any.
But - given we are NOT talking about a breeding situation (in which case I would recommend one F070/F075 per mating pair) for sure you are going to be able to get more than just 2 or 3 birds in there. Four for sure, probably even 6 in that cage.
In support of my estimation here are some other people who actually DO have Gouldians:
See Sally's post, #2 in this thread -
http://www.finchforum.com/viewtopic.php?f=2&t=1728
In this thread they are talking about the smaller F040 and people are still keeping 6 to 8 Gouldians in these. Non-breeding of course.
http://www.finchforum.com/viewtopic.php?f=2&t=27920
Just be sure to strategically place food and water so that they have to travel up and down as well as horizontally. Also, make sure you have at least one water source (I recommend silos for oh-so-many reasons) for each pair.
For their staple seed and any treat cups I would start with one per each 3 to 4 birds (go up if there is squabbling). I would put in 2 each of cuttlebone, mineral mix (I use ABBA) and a (pre-scored so finchly beaks can use it) mineral block. The last is too hard for finchly beaks unless you break off the corners and score into it, but my guys DO use it if slowly. Nowhere near as fast as my budgies, but definitely they go at it. I also keep crushed egg shell in the cage at all times. Yes, I go nuts with the calcium sources, having lost a hen to egg-binding despite the total lack of a male in the HOUSE, let alone the cage. Anyway even though there shouldn't be fights over calcium sources I'm hypersensitive enough to the issue to think that its better safe than sorry, so double each source to be sure.
When you decorate the cage, keep the center open. I see a lot of large cages that are essentially useless as flight cages because every flight path is blocked by toys, perches, and fake greenery. Keep perches along the side short. Put long perches across the cage at different heights only at the ends of the cage. Leave the middle open so they can FLY!
And unless you INTEND to mate, do not put anything even remotely resembling a nest anywhere in the cage. That includes large feed cups. Use a silo or a hopper for your staple seed and small treat cups like biscuit cups or finger cups (thumb cups if you can find them but recently those seem to have disappeared). There is a "mineral cup" sold by ABBA or GlamGouldians I aim to try to replace the lost thumb cups, its about an inch or so in diameter so hopefully too small to lay an egg in.
I have, btw, seen one of my hens lay an egg in the "egg" cups intended for whole eggs. So - anything REMOTELY like a nest, like I said, LOL!
The equation changes entirely if you intend to breed them.
As for drafty old houses - unless you're letting it get below 60F, its not the temperature that is an issue so much as the drafts. Just don't place the cage in a draft and cover the backs and sides with a sheet or similar. You need to do that anyway (along the back at least) to keep the walls clean anyway. But hanging it along 3 sides like that will cut off most of the drafts and you can work with just keeping drafts from blowing directly in the front then.
Hope that helps.