In 2009, the same society together with the Tau Zero Foundation announced Project Icarus, a similar spacecraft that could achieve 15% the speed of light.
That year, a physicist called Friedwardt Winterberg announced a fusion spacecraft that could be used as a capacitor to produce proton beams that would ignite deuterium micro-bombs. However, this technology would have to be constructed in space and the cost would be too expensive. For this reason, Winterberg proposes that the nuclear fuel could be ignited by Marx generators.
In this line, Chief Scientist of Icarus Interstellar Adam Crowl has suggested that a two stage-configuration of the Winterberg rocket could achieve 20% the speed of light. The starship would weigh 120,000 tons, and the amount of deuterium needed would be 12,000,000 tons. It would only take around 20 years to reach the closest potentially habitable exoplanet, Proxima b.
Considering that the first nuclear fusion rocket could be ready for launch by 2028, how plausible do you think this nuclear rocket design is?