Oh, It will slide, just not as well...
but if you use this as a learning experience, you can take the lessons learned and apply it to the second build, which I guarantee you will want to do !
I reckon you have made the hull too deep, probably only need an inch or so at that size.
air rudders would be easier to setup, and with a water rudder, she'll definately handle like she's on rails - no sliding at all!
don't forget to waterproof the electrics!