-May I ask, what exactly will be the difficult part? I'm not being facetious, I'd really like to know.-

It might be relative. The first modern cage I made took about a half hour. I bent it under radius at first, and had to make a second piece. After the bow, I made the hard bends in a vise, then I end welded the wire. Come to think of it that might require a weld, unless one sleeved it. So that kind of thing is easy. I took it on a 1000 mile trip and it performed fine.

On your construction, I would use a ring roller to make the top hoops. Look up fret bender, there are some plans online for ones that used a few bolts bearings and wooden bits. The ring roller gives you the perfectly circular ring, vs. a series of parabolic distortions. Same deal for the metal plaque on front

Then I would work an the technique for making the eyes. This technique is the same one used to make fish hook eyes, you might see if Partridge hooks has an online picture of hand making fish hooks, or Mustad. Of course the hook eye has an extra kink to it to center it on the shank.

After you learn to put the eyes in both ends of a piece of wire, you need to make the hard bends and loops that complete the segments that fit through the little thimble. You probably need to pre-thread that, then make your second eyes, loops, and hard bends.

Thread on the top rings. then fit the brazed on bits. None of this is particularly difficult, but it will require a lot of different parts that need to fit together very well. If you have a model to work from it will help a little, but you still need to get everything to work out for your spacing after the bends.