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Flyer2
I read some time ago when Wernher von Braun and his team of German's engineers designed the Saturn rocket for Apollo they built it only in the manner they knew how. Over designed and well thought out.
As the Apollo project wound up other folks in NASA discovered they needed more of "this" and plenty more of "that", the NASA guys would go back to von Braun and ask if the rocket could handle it .... his response always was " yes but only a little bit more".
It was why that rocket never failed.
I also worked on a team years back that dealt with space hardware. The reliability engineers stated that normal design would get you about 99% reliability at X cost while to get to 99.99% reliability would be 100X costing.
It's how much you want to pay, how much you want to compromise and how much you don't know that will cost you in the end product.
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