for realism, why don't you add balast tanks and the companion iceberg so you can 'sink' on comand? LOL --too much I know, but I could not resist.
It would seem that if you are to build the Titanic, build it Titanic. I have seen some of the R/C combat nuts who have scale battleships around 16 feet long. Impressive. I have seen similar craft, scale boats, with people actually inside piloting, at boat parades in Newport Beach, CA - just make yours R/C!