Good looking and simple set up ya have there, Phil (DARN CUTE field hand too!)
French Intensive, Double Dug or Raised Bed method of gardening.
Many benefits.
In non-raised bed uses, the plot which is 5 ft wide and as long as you make it, is "double dug" to a dept of two feet thus creating a trench surrounded by hard packed earth.
The trench holds the water the plot gets and all the nutrients where they would wash and drain away in a standard 6 to 8 inch depth tilled garden.
It allows the plant spacing to be about half what is recommended in a standard garden because the roots will grow down into the trench rather than spreading out in the shallow tilled soil.
You never walk on your plot. Being only 5 ft wide allows you to access it for weeding from the sides thus never compacting the soil.
The close spacing of the plants will also reduce weeds as the plants grow and shadow the ground below.
The only thought I had about Phil's setup is if a liner for the bed would be useful in retaining water and nutrients? I've never used a raised bed setup so I have no idea if it would "leak"
This is the most productive method of gardening and can be done totally organic and produce "per acre" yields above the large chemical/mechanical outfits of the agro-business.
I've grown corn in double dug plots with success. Just have to have several rows of corn, maybe six in one plot or three in adjacent plots because corn needs cross fertilization of the plants.
There should be three feet of space between adjacent plots.
Not only a good setup, Phil, but good experience for your girl.
I can see from these and the other pictures you have posted that the is really into learning and doing.
Very good job, Daddy...