Hyperion does not have a detailed diagram of the heat piping but there does not seem like there should be anything special about the heat piping system. In this presentation on slide 34 and 35 they have the density of heat pipes which seems appropriate About 1/9th of the volume taken up with heat pipes
The electric power generation is based on standard turbines which are about 40% efficient. There is new thermoelectronics which could double that efficiency.
For space vehicles, one could replace the heavy radiation shielding with lighter alternatives like electrostatic shielding.
I talked about using the simplified solid core nuclear reactor for enhanced recovery of shale oil to help resolve peak oil.
I examined using the nuclear power in combination with the Vasimr plasma rocket engine for 39 day trips to Mars
I also discuss using this technology as one of several technologies that would make civilization more resistant to disasters.