A friend is getting a new gas oven for his kitchen and taking out the old electric oven. There is natural gas in the house for the water heater and hot water baseboard heating system. He was considering taking off the gas line main that feeds these two items, and putting a ball valve and then running 5/8" OD soft copper with flared fittings up into the attic and then down the kitchen wall behind the oven and then putting another ball valve and connections for the oven. The kitchen is inaccessible from the basement. Any thoughts on this?