no no no!! you can not put these birds together. I am sorry but big birds and little birds? soft and hookbill? no way ! Also hope you have alternatives for when it rains and gets cold out. 
Also... Before introducing new birds to your existing population, whatever species you end up with, have each bird checked by a good avian vet, screened for disease, and quarantined for probably at least a month.
Female cockatiels and other psittacines can become egg-laying machines, leading to things like calcium deficiency, egg binding, and other problems. A female with an overactive reproductive system can be quite a headache, and it can take quite a commitment to the bird and adjusting the environment to downregulate the cues for breeding.
And a double door system is a good idea.
Don't worry, the birds have been checked up.
The chickens are also beening checked for diseases.
There door has a pulley system.
Ok so no softbills, i have done research believe me, i have been told that softbill will be fine with these bird thought?The aviary is not quite done yet, nest boxes and other things are still on there way.
Wow what are you guys the avian police?
Ha ha nice avatar
ya i guess i should not trust my Australia bird forum, so now what other birds could i keep in there?
Thanks i was just joking about the avian police thing.
Don't worry about food, i got it from a top bird breeder in the western cape, unfortunately i did not talk about stocking birds.
P.S do you know any bird forums that, well know birds?
And could i keep budgies in there?