I am building a new home and would like the back wall of the house to be sliding glass doors. The opening is 17 feet wide and 8 feet high. I am thinking of either a telescoping or side stacking track (like a storefront). The doors need to be insulated and weatherproofed for winter (moderate snowfall where I live in Canada). So far, the only company I can find that makes these is Nana Wall Systems. Very expensive and long lead time as they are made in Germany and then shipped to North America. I have been researching this for 3 months so any suggestions would be much appreciated!