What kind of pigs are you thinking of getting? Just a suggestion, smaller ones might go better in that set up. See what's available in your area. I've been looking here, not for smaller ones myself but saw some Pot Belly, Iberian black cross piglets for sale at a organic farm. They liked them cause they were easier to handle, and still got to a decent weight.
A outside lean-to shelter and some electric fence is all they need, would work great in your weather. Big pigs will scratch themselves on everything and blow holes threw about anything that isn't heavy duty, fence or building. If you keep them in your garage, with a outside run, you might get lucky, friend of mine raised a pair every yr for a few years in a small wood floor shed with hay and a large run just with a single strand string type electric fence and they never 'relieved' themselves 'crap or urine' in their 'house'. Stayed clean until he got some early during the cold winter here, then every pair after that did also.
Don't like the thought of a mountain lion....WOW! not cool...