I already have the steel front housing, since I've got the 5 speed. My plan was to have just the Sidekick guts put into the GV steel front, and add some traction. That's probably going to be a lot of work, isn't it? I think it'll be worth it, though. I really think a SAS in the front would be overkill for what I plan on doing, but I would spend an additional $300-$400 on a LSD if it would give me a little more traction in the front.
As far as the road salt goes, I am quite familiar with that. Between growing up in Maine, and spending several years in upstate NY, Boston and Pittsburgh I saw a lot of road salt. I had a Volvo 240 with an undercarriage that looked like those images of the Titanic sitting on the ocean floor. 90% of the maintenance on that vehicle was rust related. Pittsburgh seemed to be the worst, with the winter temps always hovering around the freezing point and all of the steep hills. 4-way stops at every intersection.....but in the icy winters that didn't really mean much, especially with that modern marvel called ABS (Arbitrary Braking on Snow....or maybe Atrocious Braking on Snow would be better). Crossed my fingers at every intersection during bad weather.