Wow! Thanks you guys!
Laurie - Thanks for all of your wonderful tips! I don't plan on insulating the ceiling since that's where my ducting and exhaust fan will go. Plus, the ceiling will be made with cedar, which I'd hate to cover up. Hmmm....what to do....what to do?
Regarding windows, the kit will come with really nice ones that are large. They're a little pricey, but I think I have to order the windows with the kit in order for the wood to be pre-cut for windows. I'm not handy enough to do all of the cutting myself.
I'll ask the kit company though...I'd rather re-use building supplies if possible.