Future fashion NEVER looks right. It always gets dated, especially civillian fashions. Military stuff usually fares better. (Compare the Imperial Officers in Star Wars to say… Lando. Or the B5 uniforms vs. poor, poor fashion disaster Jake Sisko.) (And yes, I know Star Wars isn’t technically “Future,” but you know what I mean.)
I have to agree that the title is atrocious, but I would watch. (sorry, “Giant’s Castle” is better, or even shorten it to “Type.5”, but be prepared to have a short and sweet explanation of the title in the first episode, or the opening sequence) Espescially if there were realistic space-battles, which to my kowledge have never been put onscreen.
In lieu of aliens, I’d try to extropolate the colony cultures a bit, so you can tell your Lunars from from your Terrans from your Europans or what have you. But that would really involve pushing the timeline out by another 50-100 years to allow for them to diverge, which you probably don’t want. And you’d have to be careful not to make them one-adjective trek-like cultures.
Unfortunately, I don’t think there’s much of a market for near-future SF on TV, Hard Sci-fi or otherwise. Century City flopped. VR5 flopped. Dark Angel flopped. Alien Nation only lasted a couple seasons, and they at least had aliens and alien tech. Tekwar was… well it was Tekwar, I enjoyed it but it wasn’t great. The only successful ones I can think of offhand are Stargate (which opens itself up to traditional space opera via the stargate), X-files (which is more modern conspiracy horror/sci-fi than near-future), and Quantum Leap (which only lasted 4 seasons, and didn’t focus on the future, but the past.)