Of everything in V&V, the single factor that blew me away the most was when I carefully studied the SRs (Structural Ratings).

I had a PC (my brother-in-law's character Spectre) who regularly used Solid Energy Illusions (in his case he converted kinetic energy into usually animate forms, often in the shape of a large robot).  The rules never spelled out what the SIZE was of these created things, and so it sometimes became difficult to guesstimate.  What surprised me so - after careful study - was how accurate (and scientific) the Structural Ratings were/are.  I looked very detailed at the various weights of substances, and I found that their numbers were spot on, sometimes almost scarily so (they didn't just guess, obviously, but used some scientific data to get the numbers they assigned).

So this formula that I came up with, which utilizes the SRs that are so brilliant in V&V to begin with, worked wonderfully.

Illusions: (p. 13)
     B: Solid Energy.
     Inanimate:  To find the size of any object created, use the following formula: 2/SR x CP = ft. 3 where SR = the Structural Raring of the object formed, and CP = the Creation Points expended.

The formatting makes it a bit tough to read, but where it says ft. 3 that is supposed to show cubic feet.