Spinlaunch is completely unsuitable for manned craft due to the extreme acceleration. Rather, what you want is a variation on a maglev train. In the lunar vac

Spinlaunch is completely unsuitable for manned craft due to the extreme acceleration. Rather, what you want is a variation on a maglev train. In the lunar vacuum there's not really any speed limit. You can make a very long track. Put another on top upside-down. Your train can ride on either track--once it reaches orbital velocity it will be riding on the top track instead. Human tolerable accelerations with an ejection velocity sufficient to take you anywhere in the solar system.