You should get your hands on a copy of Linda Silverman's book...

http://www.visualspatial.org/udb.htm

Upside-Down Brilliance is a wonderful book.

I think a 149 on the NNAT does indicate a very strong VS learner. Silverman also has a book about "teaching the vs kid in the traditional classroom," and the title is something like that, but not exactly.

I am a VS thinker, and always felt slow in school, because I just thought differently. I don't think I was harmed by being in a traditional classroom, it just took me awhile to understand why I was different, and why certain things were harder for me to do...

But I think every gifted child feels different from their peers.

I might consider further testing, but do read up on VS learners so you can see what is going on in the classroom and ask for tweaks if necessary.

There's a star man waiting in the sky he'd like to come meet us but he's sure he'll blow our minds