Perimeter posterity .
How Bought , assemble a large borg type or huge round space craft . that is incomplete except for a small quarters .
When we want to travel a pulsating hydrogen rocket keeps movement .
Here's where it gets good .
As the astronauts travel they keep assembling the ship .
By the time they reach their destination they've not only got a space craft , but a complex , ready to explore and even mine parts of their destination .
On it's return to Earth it , with long pointed , dart type cargo carriers , eject them at a direct angle so as to actually hit a certain area where the mining's are recovered , the pointed shape a counter to atmospheric friction causing burn . And insertion upon impact .
Just throwing something out there , you like , you write .
Gianfranco Fronzi . March / 16 / 2013