Brought this completed 72nd scale Revell kit (normally around £125-150 new) second-hand in a local shop for £30 as per photos, no transmitter.

changed 400 motor for a geared 540.
changed ESC as control was poor acted like an on off switch.
foamed bow area and added some plastic supports to the hull as shown, modify battery box.

Realigned motor to shaft painted hull add waterline and ballast and K40 runs well on 7.2 to 12v
A nice model to have a good size and attractive on window sill.