Can I suggest you start a build thread and ask all your questions there instead of starting loads of new topics.

Also you should bear in mind, no one knows what works well in a BW because few people have built them and no one has fought them in this country.

Most people are just making common sense decisions about what to use, but whether they are good ideas is another thing!
In this case I'd advise you use a small Li-Po, but you'll need to decide capacity and cells.