Indeed, this is also very clever and actually sounds quite doable (still I wonder about how much radiation it will give off when running - probably quite a bit! :D) when compared to some of the other concepts.

Actually, I kinda think it demonstrates we really are not done with nuclear engines & even better, more crazy and higher performance propulsion methods will show up. And also, we really need to finally start building some of them them! :)

Like, even some simple NERVA or NEP would be at least a start. :)