Hello kr3t3n,
As an example you have a spot for tomato's set aside to grow out of what appears to be two 6-8 feet tall and 1-2 feet wide boxes. Not to mention right in a corner. That won't work well unless your growing bonsai tomatoes. Not only can one tomato plant grow up to 10 feet tall or more, they can easily get 5-6 feet wide. Taking up 25-36 sq feet of floor space for each plant and requiring a trellis to grow on. Then theirs the issue with the 6-8 feet tall and 1-2 feet wide box itself. Not only is that a waste of materials, but serves no useful purpose. You wont get vertical rows of tomatoes growing outside of the sides of the boxes. All you will get is one tangled mess you will have to tear down and start all over with. You have another spot for cucumbers that will be the same thing.
Another example, you have numerous boxes for broccoli. Those boxes go all the way up to the roof so I can only assume you plan to try and make openings in the sides to grow the broccoli out of. However broccoli plants are very large, getting 3-4 feet wide and tall. Not only is trying to grow them out the sides ridiculously difficult because of their size and weight, you would need at least 12 feet of space between rows to accommodate them and be able to work around them. You would also have to build a support structure to support the weight or they will break off.
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Do you think upside-down grown plants would be a good option?
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No, I have yet to see it work well.
If you break it down it's simply a over priced and more complicated drip and/or flood and drain system depending on the water path. It' doesn't save anything on space. While it might be able to save a little electricity in lighting because of the circular shape, it also uses more electricity in an electric motor to rotate it. You can also turn it on it's side, take off the rotating motor, water from the top, and you have essentially the same thing without needing the electricity to rotate it.
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would it be viable to use the artificial water stream to "power" a water mill (generator) and use that to rotate growbed installation?
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Whether it's viable or not is up to you. You have to weigh the pros and cons to determine if you can gain anything, and if it's worth it.