How does Bracing effect cabinet volume?

Aside from the obvious - its volume subtracts from the overall H X W X D cu in displacement;

When do you need to be concerned?

Let's say I have a simulated design, done by a well known engineer with an un-braced volume given, port dimensions, etc. Let's say I want to put in a bunch of braces and I calculate the volume of those to be 10% off the total interior cabinet volume. Should I be concerned about effecting the simulation response prediction?

At what point do I need to adjust the interior dimensions to compensate? What's the standard practice? Thanks!
 
It could be seen as good to have opportunities to increase the baffle size, incorporate roundovers when not part of a design. This may involve crossover tweaking, one example of the limitations that exist in this scenario. I don't think 10% is a great deal for your average sealed box but vented ones have more to lose.