I picked lower right, it's different and I like the vertical look. I might even suggest a shaft of light beaming between the upper and lower center circular rim. It could serve as both a becon to make the space station easier to find and a means to show a power source venting system. Just a thought, and I said I 'might' suggest. So I acutally didn't say anything, nope, nothing at all.
Nice designs, all of them are good. (actually Great!)
Cheers!
