Nice stuff for a project I wanted to make long ago but lacked the time: Arctic war. I had planned a dedicated mini-campaign in arctic waters 1942-45, eliminating the rest of world traffic, cities, etc but adding high detail traffic, harbors, etc in the Artcic sea around Norway to play from the 11th and 13th flotillas with Luftwaffe cover, occasional support for Tirpitz/Scharhorst raids, etc. These add-ons would have just been brilliantf or it.