I'm a bit late to this thread but am also rather new to the game and at least I found it instead of starting yet another thread! I wanted to weigh in that I think this is a brilliant idea! I had the same thought the other day after spending hours repeatedly modifying, launching, testing, and reverting, ... a vessel I plan to send on my first Duna mission. I have FAR installed and the blasted thing kept coming apart on Kerbin reentry which I felt would be a bit too exciting for the brave and probably tired Kerbals after a year long mission, they will deserve some rest and not explosions. I think everything I thought of has already been touched on in this thread: * Simplifying the graphics, wire-frame etc.. so that you don't get any of the excitement of the real mission. * Being able to enter parameters such as I want a gravity well that is x deep, with an atmosphere y density and put me at an altitude or Pe/Ap of z,z1 and maybe having the ability to select a biome from a list of biomes you've already explored. The only things I might throw are : * Maybe each simulation could cost a very small amount of money/time to just slightly encourage a little risk taking. * The ability to save simulations. Be able to create a simulation called Mun and then have sub items under that such as Mun landing, roving, take off etc.. so that any new craft you build you can immediately load it into an appropriate simulation. I'm sure MechJeb would end up coming out with a plugin as well that let you automate your simulations and almost provide a kind of QC for new designs. In a lot of ways this, I believe, would make the game an even better simulation of how things work in the real world space programs. Even during the Apollo missions the astronauts went though extensive flight simulations to improve their ability to fly the contraptions as well as discover flaws in the design. These days I'd be amazed if anything flies without extensive computer modeling and testing first. It would probably be too much of a change but it would be neat if the VAB/SPH were structured a bit as if you were (and yes I see the irony here) building the vehicle in a computer, had a button to run tests in a simulator and when you were satisfied could have the system print out your fancy new vehicle via advanced Kerbal 3d printer technology. Of course you would also have the option to just have the ship created w/o testing. Though thinking about it now that's is too much of a pain. Just an extra button next to launch that brings you to the simulator building with the vessel loaded would be great.