I've started on holz #3, which will be 10 feet in diameter. The standard design involves orienting the center pieces of wood vertically (on end). I guess the idea is that this promotes vertical air flow. But this time I'm just going to toss the wood into the interior. This is where I put the irregular pieces, and I'm not convinced that with the low air flow speeds, the helter skelter arrangement will slow things down. What do you think?