I just spoke with the owner and he's going to be fix everything that has been mentioned here except replacing the return box underneath of the new Air Handler. He feels that functionally it's fine, and that replacing it is structurally unecessary.
I called Trane technical support and they agreed that the install appers to be fine. I contemplated asking him to create a false wall to at least make it look more finished, but perhaps that's a bit silly. What do you think?
I'll repost more photos of the completed job. Thanks for your help.
[Edited by kcrossley on 02-02-2005 at 09:53 AM]