Your tutorial is not entirely accurate. You should not be increasing both the Z numbers by the same amount, not should you really bother calculating the increases to the others. Instead work out 1.5 times the actual dimensions (I don't recommend scaling up however), and then increase the X and Y max scales (normally +ve, the ones in the bottom boxes in the header edit box) by approx imately half that and make the X and Y min scales (the second and third down in the right column in the grid) more negative by the same amount. For Z scale, just increase the Z max (labeled Z: in the image, its the bottom text box) by the whole amount and leave the Z min alone as it sits on the ground. It doesn't want to be more positive or negative unless you are adjusting a turret height.
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