Building A Cage

My friend is pretty good with wordworking/carpentry/whatever you call it and he's been looking for a new project. So when I brought Lola home he has been talking about building a cage for the three fids. But, having never built anything that has to be bird friendly before, we obviously have lots of questions.

We are thinking of a wooden frame with bars inserted, similar to a regular cage's bars. What sort of wood would be safe for the birds to chew on (at least from the inside, because we all know they are going to) but sturdy enough to keep them from eating through it and escaping after a while?

I would like the dividers to be bars or glass or something like that so the flock-mates can see each other. But I don't want any toes to get bitten through the bars or anything like that, because my conure can be something of a bully. Any suggestions on how to do that?

We've done some searching online for plans for bird cages, but haven't had much luck. We really love the "majestic enclosures" by cages by design I mean, if you're going to have something that big, might as well make it pretty, right? But we haven't seen any plans even close to those around.

Anyway, any tips or ideas would be great!

you can do a search for bird safe wood, either here on this site or google~ I would think that wood could harbor bacteria and be very difficult to clean and they will eventually chew it and then you need to replace