[RCD] Larry: improved attachment preview page?

While I work on a new plugin for files management. I found that we could improve our current attachment preview page. I'm attaching a screenshot from my plugin. I'd like to make attachment preview page to look the same, i.e. attachment properties on the left and toolbar with buttons (Download for now, but we could add other e.g. Print, Save, Edit). What do you think? An opposite layout would be to make it more looking as message preview page with properties on top and small buttons in right-top corner (and no toolbar). I however, prefer the solution with toolbar.