I made a German meringue cake back in High School with meringue layers and mousse filling, with the center hollowed out and some kind of fruit filling.
It was SO hard making those meringue layers because I couldn't use just a plain pan, it had to be coated with buttered waxed paper.
There is also a meringue cookie called a Chocolate Chewie that I love, and it too is easy to make, but difficult to bake, because if you don't use the right coatings and waxed paper, it is like baked on glue.
The point is, anything with meringue is going to need a lot of attention and consideration when working with it.
If you can find some videos to watch on making this cake, then I would watch a couple of them to get a good idea of what to expect while you are making this.