I don't think many people know how to do this, but as of 0.23.5, you can. 1. Go to the VAB or SPH. 2. Right-click the light 3. A little dialog will pop up, drag the RBG's around (red,green,blue) until you find the color you want. 4. ??? 5. Profit!
Get KER so you can calculate for Delta-V and also your rocket is pretty extreme IMO. Heres one of my rockets, I used it to get in an orbit around kerbin, then go to minmus to get in orbit around there for kethane scanning:
What I really want to see, aside from FAR being implemented, is the ability to modify parts. That is: -Modify the size (maybe by inputting a length/height value or clicking & dragging?) -Modify shape?? -Modify amount of contents (fuel/oxidizer/etc) -Modify colors of parts -Modify strength/durability of parts (Improving crash/heat/g-force/etc tolerance) -etcetra. And all will have an effect on the mass and how aerodynamic it is.