In my NSWR video, I used Kerbal Space Program to visualize how this awesome engine would work in an imaginary future. This came from a free fan-made mod that covered a whole host of future engine concepts – Nertea's Far Future Technologies.

The mod is available for the latest version of Kerbal Space Program, and I suggest looking at other mods produced by the same creator covering a number of other space technologies not present in the base game.
https://forum.kerbalspaceprogram.com/index.php?/topic/199070-111x-far-future-technologies-jan-7/

These and other designs are covered in much more detail by Winchel Chung's Atomic Rockets website, which is an invaluable resource if you are interested in a realistic science fiction future.
http://www.projectrho.com/public_html/rocket/

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