From purely an SEO perspective. Is it better to roll out a complete site design in increments or all at once (a launch). I'm redesigning a 12,000 page site that needs a lot of hand coding. The design is very similar, the code is a 1/5 the size and Markup Validated. It would take me 3 months before I could launch or I could rolled out whole sections of the site every two weeks. What is going to keep big G happy?
They say : " You never get to make a second first good impression", Anyway, I see two ways to look at this : 1)If you do it all at once, you get to make the first good impression. 2)If you do it on stages, you get the time to build backlinks. So it is your call