Most Bike Friday dealers sell the Tikit model, which is sort of their lower-end model. To get a customized Friday takes ordering it direct from the factory. Or so, I've been led to believe talking to them. (I suppose outside of the U.S. is different, like the U.K. seems to have a full-service dealer.)
I've discovered some other sites along the way.
PBW:
http://www.pbwbikes.com/index.php/manufacturers_id/10
Alex Moulton, which are probably too pricey, but lightweight and nice.
PBW builds custom frames and has a similar range of drive train options.
Last weekend, my wife tried out several models, like the Brompton and Dahon, and though they do fit okay, they do have a bit of extra weight. The Brompton she actually likes for the better style and nicer folding. For somebody under 5', and her strength, getting something scaled appropriately seems smart.