Interesting post. Private sector rocket and space travel efforts means new ideas and new ways to do the job. I like the use of LNG as fuel. It is a lot cheaper than liquid hydrogen or those toxic chemicals used in older rockets. The Titan fuel was very complex and caustic.
SpaceX is using kerosene, the same as the Saturn V. The Falcon Heavy produces more thrust and at least the same total impulse, yet is a good bit smaller due to higher energy density.