Over at the San Francisco Chronicle blog, SFgate, look for the comments on John King's article yesterday. 210 posts last time that I looked. Most see a big airport looking building as out of place in the historical park district, but would like to see it elsewhere in the Presidio.
The organization proposing a more fitting history center is at www.presidioassociation.org.
Take a look there at an alternative to the mega museum in that location..