Hi! I'm trying to make a series of interplanetary drives that use nuclear technology. I have made and tested modded config files that have the proper statistics for the engines (thrust, Isp .ect) However, I want to go further. Currently, all I can do is duplicate existing engines and change the characteristics. Visually, they are identical, which is annoying. 1)How do I change the rocket exhaust color and intensity? For example, a 25000K Open-Cycle Gaseous-core Nuclear engine, the exhaust would leave as a near-invisible deep purple haze. 2)How do I make engines use a different resource as fuel? The LV-N in-game uses rocket fuel and oxidizer. How do I make an engine consume Xenon gas or Monopropellant, as stand-ins for LH2 for example? 3)How do I force the game to consider four or five parts stuck together as one model? For example, I want to create a Gasdynamic Mirror Fusion engine that requires a very long tube, radiators along its length and a reactor at the bottom. In-game, I would attach two Gigantor XL solar arrays to an S1 SRB-KD25k rocket booster, and on the bottom, link an Advanced SAS Module, Large to a PB-ION Electric Propulsion system. My wish to click on the 'Gasdynamic Mirror Fusion' engine and have all five parts appear stuck together and functioning as one engine. 4)How do I make engines consume ElectricalCharge as a resource? 5)How do I make models bigger or smaller without using modelling software? Is this possible through configuration files (rescale factor)? Thank you for your answers.