I'd like to contribute to this thread but at present I don't have the time (big assignment). However I will say this...if we want to expand into the solar system, or even have regular Earth-Moon transportation and commerce, we're going to have to develop far better technologies than using what are nothing more than glorified fireworks. This insistence on using what is basically 900 year old technology will keep us in LEO (just barely) and that will be the end of it. If you want to make lift to LEO/GEO etc, cheaper and to allow us to move out into the solar system, we need means of propulsion far better than what we have or are considering of using, to do the job.
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