i'm trying to improve the soil quality in my yard, it's hard and clay-like and roots have a hard time going down below like 4 cm. i have cow patties, rice hulls, rinsed coco coir and some cardboard.
currently the plan has been to mix up the patties and rice hulls and bury that below ground (completed already), then mulch with the coir + hulls + patties, then finally cover with cardboard. the yard is small so not much cardboard involved. i'm growing cucumbers, tomatoes, peppers, eggplants and beans this year, they should have been in the ground already but i wanted to grow from seed and my cats got to the sprouts. so i gotta get new ones 
please tell me what i am missing or what i could do better.
the lasagna bed is what i was aiming for, but due to how my yard is set up it's difficult to get more than like 2-3 layers without needing a raised bed to keep the dirt from spilling out onto tiles/patio. to get around this i ended up doing a lot of digging to get the manure/rice hull mix into the ground, but ultimately things did not go quite as planned and i basically just ended up digging up most of my yard and burying a lot of poop underneath. i'm not sure what to do next, i could just stick to the plan and keep mulching with a poop/rice/coir/dirt mix and cover with cardboard, but i'm worried about smells and bugs when summer really starts rolling in. also the dirt is way too elevated without even mulching and will definitely start spilling over into the rest of the yard if i mulch.