Kerbal Space Program

Since there will be a budget to keep track of in the future versions, I think there should be some mechanics to manage a fleet of vessels.

Like in the real world, one would design a new ship and suffer an high cost for the initial design, but building more copies of a ship that has already been designed would be cheaper than designing a new one from scratch.

Plus, there should be the ability to actually reuse reusable crafts, for example after paying a small maintenance cost to refit vessels that were recovered.