Attention Gardeners

I’m dramatically expanding my garden this year, in one of those DIY projects that’s probably way too big for me. The plans are below. I’m going to dig up a total area of 18′ by 28′ and put three raised beds therein. Around the edges, I plan pumpkins, melons, and other gourds, sunflowers, and herbs. In the plan, up is West.

So, I’m asking those of you who garden, what am I missing? Got any tips on how I should build and how I should plant?