EndeavourCmdr said:maybe the same "magic" engines that the Deltaglider, DGEx, XR5 etc use? Lol, seriously though, I'm not actually building the dang thing. It's hypothetical, within realistic limitations. It's not "antimatter" powered and it doesn't use hover engines. I'd say I'm giving it some reasonable thought.
That's solves much problems
BTW. Recently when I was designing my shuttle (seen above) I've done some calculations and it turned out Delta Glider is even lighter than it's volume equivalent in liquid hydrogen (~50g/cubic meter).