Hi Drew,
one that doesn’t cost anything but some invested hours is asking specific questions here with an uploaded attempt you did yourself. As an example see this thread: Wall Capping profile on a curve - #15 by Shep
In your case, a banded door panel should be resized with the ‘Move’ tool, not the ‘Scale’ tool. You move the entire selection of edges on one end (all edges that aren’t along the stretching direction) and move them in desired direction. Try it and you’ll see that all the sticky geometry stretches the door as you wish.
There are loads of tutorial videos on YouTube about anything you can think of about SketchUp: http://www.sketchup.com/learn/videos
There’s always someone here to help you out when you get stuck. Don’t spend hours getting frustrated on something simple where you can have the answer and advise here much faster (for free).
but at least show what you did yourself to (try to) accomplish the task.