I messed around with TLUDs and crap for a couple of years. Far too time consuming & labour intensive to prepare all the materials. The charcoal from an open burn is excellent as an amendment. This design I copied from a Bitcoiner with a permie background. It's better than anything I'd tried previously. He burns green bamboo in his & them runs it through a shredder to get the particle size down. He sells the char for sats/cash & the structure of the bamboo produces really nice garden charcoal. I just burn my brown waste (I have lots of eucalyptus) & get the charcoal as a by product.