Paddle Boat

Paddle Boats hull is made of Styrofoam, so you can give opportunity your imagination as you wish.

RC controls are inexpensive and I'm purchased here:
27MHz
https://www.sinoning.com/products/5ch-27mhz-remote-control-unit-receiver-board-remote-control-for-tank-toy
2,4GHz
https://www.sinoning.com/products/6ch-high-power-2-4g-50-meter-remote-control-receiver-car-model-ship-diy-6-15v

The Motors are also from the same source:
https://www.sinoning.com/collections/motor/products/130-micro-dc-