You can get rid of the ventilation ducts by scaling them all the way to 0%. To scale the ship down you must reduce the scale of each individual object. Right click on the object, select scale form the popup menu box, select "uniform" if you want all axes to be proportional (for an exact miniature or blown-up version), and just move the mouse laterally to enlarge and shrink the object. Pay attention to the percentage increase/decrease in size, which is indicated in the upper lefthand corner. You could open them all simultaneously in Wings3d but I don't see the advantage in doing that. Wings3d automatically centers many 3d parts so you won't get an idea of what they'll look like when they're all together.
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