First time posting here so I hope I'm doing this right.
This is a really interesting idea. I've been using hugelkultur beds for a few years now and I've also been experimenting with vericomposting trenches as well. This seems like a great way to combine to two. In winter, you could insulate the whole thing with straw or something similar and allow the worms to overwinter. I think I'm going to build something like this. I love gardening experiments!