i still new I just have lot for suggestion 1.Create & Developing Spacesuit and Spacecraft complex it start weaker suit that can't walk on moon and very heavy another during developing you have made that you can walk and light but can't protect Radiation {if you planning that] or walk on Atmosphere planet or moon than more developing you have better suit you have for spacecraft do almost the same thing like protection for outside for space and better engine and more like wing that go 300km also like solar panels can reach light from korbol to kerbin than to more better that go kerbol to jool and for manned ship you can build by part like the real space program for stack limit like to build you capsule you to have get window cost 300, crew hatch 500, other 900 and it said you ship is done +1 from 4 to 5 stock and do same with unmanned with their own 2.Propulsion Complex also we know the fuel is very free and never ran out in KSP and my ldea is have more than fuel is added oxygen fuel tank in began it start with Oxygen and fuel only than improving to from oxygen and fuel to special fuel than change to nuclear fuel for long time trip 3.Recovery and Repair Complex when the spacecraft return from flight can be Recover to Complex to Repair and can be reuseable or take away also recover any you need like science ,Tools and even food and Drink ,like your capsule can reused and repair for the cost 300 and use for 10 time than no longer reuseable
