How do you grow a saguaro cactus in Washington state?

It's a challenge to grow a saguaro cactus [Carnegiea gigantea] in the moist climate that's found in Washington state. The saguaro is a desert cactus that's used to high heat and light, and low moisture and vegetative competition. It most likely won't like the outdoors in Washington state. But it may do quite well inside, where the moisture, humidity, and temperature may be monitored and adjusted to respectively lesser amounts, lower levels, and higher ranges.