Adds two bigger steam turbines (MK2 and MK3). Same steam consumption per MW as the vanilla turbine, so upgrade savings are purely about space. Power output is configurable in mod settings.
It's possible and I initially wanted to add two new types of heat exchangers. The reason why I did not add them is that I have no specific graphics for MK3 exchanges (only for MK2). If you know where to get fancy exchanger graphics for MK3, I'll consider adding it.
P.S.
It should not be a kitbashed vanilla exchanger.
If I'm not mistaken, I saw the graphics for the new heat exchanger in the Linox mod as well. It also uses the same turbine graphics that you're using, especially the MK3 turbine. The first time I saw these graphics was in the Erendel mod for Space Exploration.