If you have fully dimensioned & defined the sketches used to create the parts, you can use the ModelRescaler macro from http://www.lennyworks.com/solidworks/SWXMacros/macbuild.asp
The macro will have to be run on each part separately.
I've used Scale to much success. If uniform, scale about the centroid. Can you use tables in the drawing? Label the different dimensions and use a table to show different sizes.