
Finches and canaries must NEVER, EVER be kept with any kind of hook beaked bird - cockatiels, ringnecks, anything like that. The hooks are just too aggressive - there are many, many cases of finches being killed or having toes etc bitten off - it's just a bad idea!
And aviary panels - check Ebay, there's some on there at the moment, also some decent complete aviaries as well. Freeads too, just be careful - when my Dad (who is clueless about birds) bought me an aviary years ago, it was ruddy useless, I had to modify quite a few things to make it better. Of course, why he bought a tall, perching-bird type aviary for big, ground-dwelling quails is beyond me... :D