I plan to set up my first vermi-composting system using red wigglers in my garage, modeled after the one shown by YouTuber Larry Hall (video link). One minor difference is that I'll use two 5-gallon (20L) buckets instead of one. Top for bedding/worms and lower for excess moisture. I plan to use peat moss as the bedding like Larry did, and feed them shredded or blended kitchen scraps. My understanding is that in addition to what I feed the worms on the surface, they will also consume the peat and eventually turn it into castings. My goal is to have a bucket of castings, and start over, adding more buckets as needed as the worm population grows.
What is not explained in the video (or any other I've seen) is how deep to make the initial bedding/peat in the bucket when I start out. Knowing red wigglers stay within 6 inches (15cm) of the top makes me think I should start with about 6-7 inches (15-18cm) of peat. So I'd lay some newspaper on the bottom of the bucket, with a 7 inch (18cm) layer of moist (not wet) peat over it, and the worms on top, and some moist bedding (newspaper/cardboard) over that.
Are there any flaws in my plan? Should I fill up the bucket to within 6 inches (15cm) of the top with peat, and somehow the worms will convert everything into castings over time?
I'm excited to get started, but want to be sure I do it right, so any help or suggestions will be greatly appreciated.