- Internal volume need to be maintained. If you're going to over do it, cabinent dimensions need to be adjusted.
- Air movements should not be restricted. Brace all you want, but make sure air can still move freely. Don't create subcompartments inside your cabinet connected by small "ports".
- Try not to create "symetrical section" with window bracing in your cabinet. Something about standing waves when compartments have dimensions that are multiples of each other.
- You will have to move speakers around. Too late for me. The combination of 1" MDF and extra bracing requires two people to move the speakers around.

In the end, I think I did over do it. But it didn't take that much extra work during the build. The only draw back now is that they're a pain to move.

Gar.