First, how does the top bar hive differ from other hives in terms of pest problems and pest control? How exactly do you apply whatever pest control is necessary in a top bar hive?

Second, I have seen a lot of conflicting opinions on entrances, bottoms, and ventilation. Thoughts on these three things would be greatly appreciated. I haven't actually built my hive yet, it is still in the planning stages so I want to get everything straight now so I can build it optimally the first time, rather than having to fix it later.

Third, most of the plans that I have seen, including the one that I have chosen, are approximately 44 inches in length. Aside from the awkwardness of it, is there any reason that I couldn't build one larger? 8 - 10 - 12 feet long?