Reserve funds to build a Gen1 U.S.S. Enterprise interplanetary spaceship, using only .24% of the nation's GDP

It is proposed that the US dedicate .27% of its GDP each year to the NASA Enterprise program. The Enterprise program includes the building one new USS Enterprise spaceship per generation, that is, every 33 year. To get off to a fast start, the first ship, the Gen1 ship, will be built on an accelerated schedule of 20 years.
In addition, no spending should be cut from NASA’s existing budget; we don’t want to raid money that NASA gets to fund development of the Enterprise. NASA is already underfunded. NASA spending today is only .12% of GDP, compared to .50% of GDP during the Apollo era. At .12% of GDP, NASA’s budget is just $18 billion per year out of a $3700 billion federal budget!