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Because the point of this game is to have people prepare for a sci-fi expedition into the unknown. As this is the planning thread, and not IC, you designing a ship is not the same as your characters (the crew) designing the ship. If you want to be IC about it, then right now you
are the entities putting it together. You can have whatever you agree on and is (reasonably) physically possible, however wise. If multiple entities for whatever reason make a SNAFU (as sometimes happens) then they make a SNAFU. Since the current direction of design isn't an absolute trainwreck of nonsense, I don't need to intervene and redesign it for you, but as I said in the OP, I will participate. I say "keep it mostly hard-sci-fi" because that gives a common realm of possibility from which to argue, so it's not so much arbitrary space-magic. I want to argue sci-fi and design, and will only put my foot down if things start going in circles. Which they have on some things.
Basically, if someone says their character needs artificial gravity to stay healthy, then they'll suffer if they don't have access to it. This kind of detail is important for RP. People are free to say that their character can go without, too. So far I'm also assuming that everyone who needs to breathe, breathes the same gas.
I want to know how large the ship is. I want to know what it's equipped with. I want to know how people get around the ship (whether they can walk due to gravity, or have to float/climb around). I don't need to know how long corridor 3B is, or how many rivets are on the coffee maker.
The quantum computer thing comes form Kevak vaguely saying "we need a huge computer bank to do anything." Since he didn't say what he meant by huge, I'm putting my foot down here because
no one had suggestions on how big it ought to be, and because of the following logic. We can assume that more advanced tech will use space more efficiently, so more computer power in a smaller space. Quantum computers, by nature, are far more compact. So, 10m of advanced quantum computer should be enough computer for pretty much anything. This is to stem potential "We need 500m of computer to even support something equivalent to a human."