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II. 2. COMPOSITION. The use of plastic is encouraged; however, the use of other modeling materials is allowed as the builder sees fit. Judging standards of finish, attention to detail, and authenticity will be the same, regardless of the materials used.
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-From the IPMS contest rules.
There used to be a percentage rule but yes, as stated, the amount of plastic isn't that important any more. But do keep in mind, it is the International PLASTIC modeler's society

The IPMS has been allowing metal figures for as long as I've been a member.
I think it's more a state of mind thing now.
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Documentation of Boxcar panels not allowed
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What's that? They didn't allow the documentation or your boxcars?
To my knowledge there were never any rules stating that dioramas need to be made of plastic.
I'd be interested in hearing the whole story about this one.