New hugelculture

a little back story. I live in a trailer house that the previous owner had put on the property in a dip. to the south is a gravel road and the rain water runs down in and comes in at my drive way. it then runs down and under the house. I have a pasture in back that i would prefer the water runs into. I also do not want to stop the water from coming on to my land as i like to have it "store" in my ground. to the north of my house , 20 feet away, is my engineered septic system. the system is a mound 30 feet x 80 feet x 6 feet tall.
my plan is to make another mound / hugelkulter to make an L shape around my house, 1 leg the engineered septic the other the hugelkulture bed.
I started by having people drop off trees they wanted to get rid of. then i had a guy give me 100 loads of old wood chips and firewood. so the beginning of the bed started to come together. I piled all of the logs, firewood and branches in the middle. then i cover it with broken down chips and dirt, then a layer of old hay from some free 1000 lb bales,then some more chips mixed with dirt/ broken down animal manure from my corrals.
My hope id to cover this huglekultire with perennial herbs and have the fall rains irrigate this for the year. the engineered septic mound is covered in chips and planted to Lavender with no irrigation.
these are pictures of the septic mound

here are some more of the new mound. will add more as it gets planted