The way I did it was to duplicate kakamei theme (not the blue) and put it in the my-template.
Then started with the BB header, I copied what was in the WP header. I took everything out after the body tag except for the “main” div. The BB footer I did the same. I just made sure there were enough div closing tags. Then copied over the codes that apply for the header and footer from the WP css. Most WP theme has two column one main and one sidebar. I treated BB like it was wordpress, one side the main section and the other sidebar. I treated the MAIN div as the main section and View/Hottags as the sidebar. I know this is not the best explanation but I hope you get the idea. It just takes a lot of css work.