Landscaping is under way and 100 windows arrive at the Carlisle, Mass., farmstead, but there's a hitch in progress on the wall that's to surround it: the fieldstone must be returned because it lacks “character,” says stone-wall expert Nick O'Hara. Inside, host Kevin O'Connor, carpenter Norm Abram and designer Kathy Marshall plan the kitchen. On “Ask This Old House,” projects include fixing leaky valves and a leaky drip-irrigation hose, and replacing a rusty cellar door with a fiberglass one.