OK...I like your idea...you wanted some other ideas so I was sittin' here this morning thinking...what would I build that would be 1. Unique, 2. Functional, 3. Get the best use out of the sun...sooooo...
I know I have circles drawn, but they are easier to work with instead of Octogons...anyway...build a three level Octagon shaped planter that has rollers that rotates 360 degrees...motorize it but gear it where you get 1 rev/hour...you don't want to sling the plants out of the soil...
...then on the north side build a cantilevered platform where you can access the plants at each level...you don't have to do anything...just get on the platform (and for comfort's sake, you could even build a chair/bench to work from when you need to fool with the plants...
Is that original enough for you?
I will build and install one of these in your own back yard for the small fee of $10K plus travel expenses...I don't travel cheap...
But Wait, if you buy now, you can have two of these items for 3 low monthly payments of just $6k...yep, you heard that right...three LOW monthly payments of just six thousand dollars...
Note: Taxes and Licenses and Building Permits extra as applicable...
sorry, I just couldn't resist...hope you kow I am just kidding about the building it for you...but I am dead serious about the design..