That job looks awsome. Heres an idea though, when ever I do horizontal installs whether in a crawlspace or attic I just use the pump ups like you would use for heat pumps to support the air handler. I know you would have had to put down a good size piece of plywood in the attic to give yourself a solid level base though. The only reason I mention it is because it's just so much easier than hanging them and it doesn't get in your way for service like the rods. I've even built boxes out of tin to whatever height I want to set them on to get the unit on the same level as the ductwork. Your work looks super though.
Remember, some poor fool has to work on what you install someday, and it might even be you.