I knocked out the under- (and over-) cabinet lighting this afternoon:
That's 2x2 aluminum angle from Home Depot. (John Kim at Res4, when I asked him exactly what they were envisioning for the flashing to cover the light fixtures, directed me to the exact aisle in Home Depot where these could be found. THAT is the kind of expertise you're looking for from your architect.) The fixtures should probably be located a little further toward the front of the cabinet, but I didn't have much wire to work with. They look great (though they're fluorescents and have a bit of a hum).
And as an aside, turns out I had no idea how to spell fluorescent. U then O. Who knew.