The ingredients are right. And sometimes adding stuff later is the only way you can build it up. And when you put down a final layer of mulch on the top, you want to make sure that
water and air pass through that layer easily.
But I see lots of people advocating layering the insides. They think of this as combining lasagna gardening and hugelkultur. It is my position that the layers of stuff on the inside is not as good as making the insides lumpy, bumpy and crazy. Some spots are heavy on carbons and some spots are heavy on nitrogen. And some spots are heavy on dirt. Some spots are soupy wet and some spots are bone dry. Some spots have a high pH and some a low pH. This is more edge in many flavors of edge, inside the hugelkultur.
With lasagna gardening, things end up being too much the same everywhere. Less edge.