Waist High Ergonomic Plantar box

I had a small plantar area with landscape wood which was getting no use at all. Unfortunately, when we first moved into the house, some paint products and cleaners were dumped into this plantar area. We had flowers no problem, but we really wanted to have an edible vegetable garden. We have 2 little kids, and we definitely didn't want to grow anything with chemicals in there. Even after we digged the old soil out, we just never felt comfortable. I'm a Physiotherapist too, so ergonomic and dealing with proper posture is a must. I see so many clients with back and knee pain from kneel down gardening. So that's how this project started. Please keep in mind, i have absolutely zero carpentry skill and am not handy at all. Just a willingness to try and see what i can do. Enjoy