At first glance, assuming the whole thing is 9' in diameter as you say, it looks like you're not allowing nearly
enough room for the sprawl of cucumbers, squash, watermelon, eggplant, and potato. Also, which way is North? It's always best to put taller plants to the north of shorter plants. That way everything gets a share of the midday sun. (Assuming you're in the Northern Hemisphere. If not, then reverse that.)
I also don't understand the
hugelkultur pentagram. Clearly you are using some spiritual principles in your design, and I don't intend to knock that aspect, but for a
project like this, you would do better to sheet mulch the entire area and save your hugel material for other areas.
As for the Fibonacci numbering system - I just don't get it. Nature tends to follow fractals or Pareto's law. Fibonacci numbers are more of a mental exercise than a spiritual practice for most people. I'm reminded of the followers of Pythagoras, who threw themselves into the sea when they realized that math doesn't explain everything. Don't make thier mistake.