It’s the middle of nowhere and the hour is nothing, a sliver of time dutifully noted by the alarm clock’s efficient blue glow. It’s surprisingly cold here in Pearlington, and the volunteers burrow more deeply into their bunks, grateful for the woolen blankets that stave off the chill. In the darkness, shadows rise and fall, punctuated by soft groans as worn bedsprings do what they can to help tired shoulders. This isn’t the Four Seasons, but as far as volunteer camps go, this wooden bunkhouse is luxury accommodations, a home away from home. The scrape of clay-caked Timberlands on the bunkhouse floor announces the latest arrivals – a father-son team from Dansville, N.Y., here to spend a week building houses with Locklin’s group. Next week, fresh volunteers will arrive, some armed with little more than goodwill.