This is my late-game cargo ship among the five planets with 69 cargo bays in total and an avg speed of 460km/s (with high quality engines).
No need for any infinite technology. Easy to kickstart. Totally self-sustained except for fusion power cells, and once started, it doesn't need to stop (etc. to produce ammunition) any more.
Only the engine-related parts require quality upgrades, but it's not necessary.
If you use the blueprint with five-star quality, the avg speed is about 460 km/s; you can use the upgrade planner to downgrade the 5-star parts, and after downgrading to normal quality the avg speed is about 280 km/s.
To kickstart the ship, set the number M at the front to a small number, and gradually enlarge it. For example, my usual way to fully start it is like this:
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Apply the first blueprint and enable the "starting" requirements group and wait until the fusion power station starts working;
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(ctrl+shift)Apply the second blueprint, set M to 1, head towards Vulcanus(it might take 2 to 3 minutes to start off);
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Head towards Aquilo;
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When passing Gleba set M to 40, keep going;
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At Aquilo set M to 400, let it shuttle between Fulgora and Aquilo and leave it alone. soon it'll be fully started.