I just happened to login today. I have been out of the county so sorry I did not post sooner. Is your client still looking for an SEO consultant?
If so I may be able to help. We work directly in partnership with Google as well as we are extremely familiar will MODx and how to optimize it for SEO.
If you tell me what type of business your client is in I can let you know if we can help.
As it turned out, they are already showing at #1 for their most important search term, and between #2 and #5 for several others. I may be a simple, uneducated grandmother, but it appears I'm not so bad at this web development stuff after all