Ok , so lets find out what you have so far and then we can go from there and make suggestions .

Engine ?
thin , light wood ? ( 1/32 or 1/16 )
foam ?
Radio gear ? ( servos , TX , RX )
440 rods ? or an old bicycle rim that still has its spokes ? ( use the spokes and its the same as 440's )
horns ? any hardware for installation?
battery pack ? for Rx in boat ?

Give us a little info and we can help out from there .