How long would it take to build a spaceship?

I'm working on a science fiction story which includes the following premise: Tony Stark invents an unobtainium reactionless engine, and the protagonists want to build a spaceship around it, big enough to carry a nontrivial amount of cargo. They have a company similar to SpaceX, enough money, political authority to bypass red tape and a mandate to waste anything but time.

The current idea is to basically take the design of the C5 Galaxy, cut the wings a lot shorter and replace the landing gear with helicopter style skis (the unobtainium engine is VTOL-capable), make a few other tweaks and that should be pretty much it. (Planned flight times are only a day or two, so no worries about extended life support.)

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How long would it take to build a spaceship?

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