for modification, you need to get the following parts:
1)Brushless ECS ( you need to plan how many Amp ESC do you need )
2)Brushless Motor ( you need to plan how many KV do you need )
3)Servo, Receiver and control set.
5)船"獎"size 都好重要
6)船的重心同, motor, battary install location and water cooling.