Tamiya has released U.S. Marine AAVP7 A1 with UGWS w/Submarine Motor in 1/35 Scale Models assembly kit under Trucks / Vehicle Military Series category
Tamiya #89736 - Tamiya 1/35 U.S. aquatic AAVP7 A1 with UGWS - w/Submarine motor
the following is Tamiya's excellent 1/35 AAVP7A1 kit, now with an awesome "submarine motor" that connects towards underside with this hull for play-action fun! engine requires one AA battery power, not included. That is a certain limited-edition kit.