Consider the implications of making models overscale.
We like to think we are building (or collecting) in 1/32 scale. And some of the time, or a lot of the time, manufacturers give us true 1/32 scale models. We establish a feel for how big things are in 1/32, after a while.
Then along comes a 1/30 or 1/29 scale model. Maybe it is a Cartrix W196, maybe it is a Fly Lola GT Mk IIIB, or a Chevron. Some of the guys measure a few linear dimensions which are a few mm's too long. After all, what are a few mm's? Seems negilgible. The people who complain seem too picky. The jump from 1/32 to 1/30 works out to 7% oversize. From 1/32 to 1/29 results in 10% oversize.
But let us take a look at the "feel" of the model. We live in a three dimensional world, and we perceive in three dimensions. Visualize a cube with dimensions of 10mm along each edge. The volume is 10 cubed, (10^3). Such a cube has a volume of 1,000 cubic mm. Now pretend this is a scale model, and it is in 1/29 scale rather than 1/32. Each dimension is increased a measly 10%, but what happens to the volume? It increases by 33%; the volume is now one third larger than it should be. (10 cubed equals 1,000 cubic units, while 11 cubed equals 1,331 cubic units).
This is why people sense that models built in the 1/30 to 1/29 range are WAY overscale. They are getting on to one third more hefty than they should be. The linear dimensions do not tell the whole story. It's the volume we see.