would this be a good box?

[mazdakid 5,000+ posts]

What kind of music do you listen to?

The bracing and 45s will raise your tuning a little bit, but not by much unless you use a lot of bracing and huge 45s.

 

[hispls 5,000+ posts]

Don't bother going with manufacturer recommended box designs. I'm sure you know better than them what will work.