Difficulties modeling materials that may be ordered at various dimensions

[Christian Carlow]

I'm having difficulty determining how materials that may be ordered at 
various dimensions should be modeled.  For example, two orders can be 
placed to the same supplier for the same part but at different diameter 
lengths and thicknesses/depths.  I assume that each of the dimension 
variations should exist as feature variants of a virtual material 
product but wasn't sure if this would be correct since there are length, 
width, and depth fields already available for products.  I'm pretty sure 
those dedicated product dimension fields are used for shipping purposes 
but wanted to make sure.  Does anyone see a problem providing the 
dimensions as selectable features to a virtual product?