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    GP30 by Atlas?

    I agree. The short high-hood of a GP7 isn't even the right kind of hood for a GP30, as the GP30 and later EMD units have a "pointed" end to the hoods, instead of the "flat" end of the earlier engines. Using the tail-end of a second GP30 shell is rather straight-forward, as seen in my attachment...
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    Styrofoam Cookie Cutter Layout??

    Another option would be to use foamcore cardboard in lieu of plywood in a traditional cookie cutter design. The foamcore does need more support (shorter spans between supports) than same thckness of plywood, of course. But if you start with a foam base, you can cut blocks of foam and put as...