Hi, I'm new here, and new to fireplace inserts.... I'm buying a PE Summit insert to replace the existing gas fireplace in my new home. Has anyone had any experience in taking out a gas fireplace and putting in a wood burning stove insert? The existing chimney only goes up around 12 feet, so I'll have to add another 15 feet or so to get up above the roof line, and then insert a SS flex flue. Has anyone done this before? I'd like to try building it all myself because I'm quite handy. Any help or advice would be greatly appreciated! Cheers, Stewart.