Elon Musk Gives Everyday Astronaut a SpaceX Starbase Tour | NextBigFuture.com
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Brian Wang
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Summary
They are not considering the ISP or other metrics.The current cost per useful ton of material to the surface of Mars is $1 billion and the current goal is $100,000 per useful ton to the surface of Mars.The grid fins and many other parts are not optimal but will work.
As said here by Brian Wang