Personally I don't know how to use Paint and I can barely draw a stick figure, so people would have to take what I can give them lol.
My suggestion for the partition would be to use several small panels that can be attached together to make a wall, but can be easily carried in and out of the aviary when they're not linked together. There just isn't room in an aviary to move big pieces in and out.
The original door on my aviary is sort of an example. It was built as a Dutch door, meaning that the top and bottom halves were basically two separate doors that opened and closed independently of each other. I thought that this was a nuisance so I fastened them together with straight brackets and now it opens and closes as a single door. But I could make them separate again at any time just by unscrewing the brackets. Here's a picture:

Notice how there's a lock for the top part and a separate lock for the bottom, and each section has its own set of hinges. That's because they're really two different doors.
There are two different ways you could use this concept. You need a removable door in any case so you can get into the part of the aviary that's being blocked off. You could make the rest of the partition wall in small linked panels so you can take it out completely when you're not using it, or you could keep the partition in there permanently and just have a removable door. All you'd have to do is unscrew the hinges when you're ready to take it down, and separate the two door panels if you're using a two-part door like mine. Then carry it out and you're done, and the birds are free to go through the open doorway whenever they want to.