That's a fun idea. I didn't realize the plot size would allow for you to fit three courses that far apart. Are you using the environment expansion glitch?
I'm currently about 1/2 of the way through on a similar project where I am building three courses on a single highlands plot. Outside of some very minor planting, I've only done a tone of sculpting and complete hole layout and design (including bunkering). After 33 "completed" holes, and am still sitting pretty with 5% of the planting meter used up. I imagine your island approach will free up even more space since the water will cover up so much territory.