For the money you'll have to spend on the Revell kit plus extras from New Ware and RealSpace, you'll be into it for well over $200.
For that kind of money, have a look at the Apogee Rockets 1/70 Saturn V: www.apogeerockets.com
It's extremely accurate, but it's designed for flying. So there won't be any interstage engine detail or removable BPC/LES. That stuff could probably be scratchbuilt though, and in the end you'll have spent about as much and have a big honkin' Saturn V.
It's not rocket science