Well, lets see..the large mat is 3X6, where as the DW book assumes 4x6'...eh, its close enough to make it work. One of the gamestores we play at in Virginia has 5x5' tables! Agreed on the islands; I think they would work fine for DW, though they might need to be sci-fi'ed up a bit with some smokestacks or other machinery
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I tell you though, the mat I really want to buy is one of the mousepad-material F.A.T mats from Frontline Gaming. Their sea mats are supposed to be back in stock sometime this month!