Those really are exceptionally well-laid beds. That raised mulch container is a good idea. When do you expect your potato plants to emerge? Also, what does that wooden box do?
I don't do raised beds too much work, too expensive & too dry they need LOTS of water every day we are often gone for a week or longer several times most of the summer. Mulch has cardboard under it to stop chickweed from being 15" tall by March 1st. Mulch is heavy it keeps cardboard from blowing away. Wooden frame is a dam to hold in water once a week for 400 onions. Bed is the same level as the whole garden. When it comes time to plant March 1st, 400 onions, red, yellow, walla walla, candy, mulch will get thrown somewhere and tilled into the soil. I get free mulch at local recycle center it is, ground up tree leaves, grass, ground up bushes, ground up tree limbs. Potato harvest is usually May 15 that is when our soil is warmed up to 65°F time to plant, beans, melons, okra, tomatoes, peppers, corn, and other seeds, potatoes need to be gone about May 15 so I can plant other things.
Most people around here TN plant potatoes about March 15 then harvest is August. Potatoes don't like our hot 98° dry summers potato crop will be small. We seldom get more than 3 rains all summer June to Sept and rain almost every day Jan to April. If we get snow it is gone in 2 days.
What looks like a bed on the left of 1st picture is just mulch. I am trying something new trying to grow carrots with 2000 seeds. Carrots never grow well in TN but if we get 1000 carrots the size of my finger that will be a good crop of carrots. I put mulch on soil then sprinkled on seeds to see if they grow. So far nothing is growing there. Need to experiment & try new thing I might learn a new way to grow carrots here that works for us. 1000 carrot seeds are $2 free postage on Ebay