We're in the process of building a Long Lang, which we'll manage similarly to a TBH. We're about to build the roof and are looking for thoughts on the best design or important features to give the best chances of success. We live in the Interior of BC, so winter involves lots of snowfall and temperatures as low as -20C (-4F). Should we use a gable roof design or flat? Should we incorporate insulation in the roof, or add it to the outside in winter, and what's the best material? Is ventilation more important than insulation? I'd love to hear some suggestions from experienced TBH beekeepers! Thank you!