The truth is that I have that doubt since I have seen that few players support the ideas with NTR engines or perhaps almost no one supports them.
And I do not say to the degree of feeling the only one, although that is my why, why there are extremely few creations with NTR
Sometimes I feel that no player wants to talk about those engines.
@ISTINC0RP0RATED - i like them, and put them to use a couple times, usually with water as the fuel - they work great for low gravity and make very precise orbit adjustments