RE: Converting model schooner to RC?
It would help if you posted some photos of the boats showing as much detail as possible including access to the below deck. Some deminsional information would be good to knowas well. First question is are the boats water tight? Guessing the construction is wood, but that is just a quess.
Adding power and steering is not a major issue if there is room for the motor and steering servo and linkage. Sail control is possible, again depending on what you have there. Access to the inside of the hull will be critical to making these modifications.
Could be fun. Look forward to more information.