Blogs MU - how to reduce/remove top headers

Hello,
This looks like a possible theme for my site but I am bothered by the enormous size of the 3 headers at the top, requiring users to scroll down to see any network activity.

These headers as you can see on the theme snapshot to the right:

1) top header with Blogs.MU => how to reduce height by 20-30%?
2) main header with the featured content/image => how to reduce height by 50% or more?
3) sub-header ("one community..") => how to remove completely?

These changes would pull up the other content so that users can see this assorted info without scrolling down. Seems like I need to do it via the editor because the settings don't allow these changes.

Thanks,
Ryan