I love it when people re-use things in such a beautiful way! One word of caution though--you have to be careful because some wood is treated with arsenic to prevent bugs from eating it. I've read that the arsenic can leach into the ground when watered, and then be absorbed by plants or even through your skin if you handle it without gloves. I don't know much more about it, but this is helpful: https://www.extension.purdue.e...

I have several raised beds for the same reason, rocks and crud in the ground. Yours looks very neat. Do you need those inner boards? I'm guessing from your photo that you have spaced them about 6-8 inches apart, which is fine for many veggies but more root room is recommended for some (broccoli, brussels sprouts, peppers, tomatoes, etc.). You said you were going to plant vines on the sides–cucumbers should be fine but melons or squash roots might need more space. You could look up "square foot gardening spacing" on the web to find out more.