As far as I know, wry neck is not something that can just develope, you have to be born with it. There may be some other underlying problem with your dove.
Sexing doves is not easy. There is no way to sex them based on sexual dimorphism. You can only tell by wether or not they bow and coo, and sometimes this can take days or weeks to be sure.
Bobs hardly ever use perches or roosts. When they sleep, they usually just hudle together on the ground. They also never fly unless they get scared, so the aviary doesn't need to be very tall.