A few years ago I built a submarine....Actually a U Boat. Its quite large- about 4 feet long. Its the Revell kit that I added some detail to and opened up some of the vents. I was going to add some figures to it, but never did. I still think it as cool model. One of the few plastic kits I have done in the past 10 years. It won people's choice award at a model show back in the day. Thanks to Jim Starkweather of Armorama for the nice pictures.