Perched on a tree stump stool, Sam Ross grinned and cocked his head in the direction of the concrete slab dangling from the enormous crane parked in his newly laid gravel driveway. Andy Starnes, Post-Gazette Sam Ross sits in front of the handicap-accessible home being built for him near Dunbar, Fayette County, by Homes For Our Troops. Click photo for larger image. Moments later, the rectangle of prefabricated concrete swung past Ross' face, then slipped into place in the muddy pit in front of him. "What's happening?'' Ross asked yesterday, anxious for assurance that work truly had begun on the...