I would use dowels mate the birds tend to hang on wire mesh and make a right mess of their tail feathers.The smaller size slate lathes would do the same job. Aviary OK. as long as the mesh is small enough to keep stoats/rats etc.out.
Copy of email sent. http://www.pigeonplanner.com/download I haven't used this I done my own on microsoft excel,so I can't pass comment.Make sure you download the correct one for your system,not the tat on the right hand side. Lindsay