I wouldn't worry about the charcoal basket. Everything else inside you can spray down. Honestly it's not needed. All of my smokers I just start using. The fats from the meat will do the job.
I think choking down a fire to lower temps creates a dirtier smoke/smoke profile, the higher the flow the better off you are.+1 on hot and fast Gr8day. I do most of my cooks on WSM but I rarely go low and slow. I get better airflow and cleaner smoke with the higher temps. I never use water pan, mine is filled with sand and wrapped in foil. I do most cooking at 300-325...food gets done faster and I can't taste the difference. Cooking at these temps I rarely wrap meat as well other that ribs. My brisket and butts stay naked the entire cook.