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The Alpha transportships were designed to carry liquids, from fuels to water. The kit includes 5 ships that could be used for existing spaceship games. Stems and bases not included. Each ship is 11.75mm wide, 14.57mm tall, and 51.54mm long.
Since Shapeways for some reason keeps messing up my picture, you can check out the SketchUp version of the model here: http://i1299.photobucket.com/albums/ag77/Stefmanovic/transportshipalpha_zpse14abe12.jpg