[Bellardia]

Homepage is stored in a variety of templates, if you want to change the organization of the forums and threads you'll have to edit at least the following templates.

FORUMHOME:
forumhome_forumbit_level1_nopost
forumhome_forumbit_level1_post
forumhome_forumbit_level2_nopost
forumhome_forumbit_level2_post

Threadbit Templates
threadbit
threadbit_annoucement
threadbit_deleted



Although you could avoid editing a few of those, you'd have to edit all of them to achieve a fluid feel.

I've done a few custom themes with the styles you're after but haven't released them public yet. I may be able to help you a bit or make other arrangements