Well, I thought about the wood + drill + screws, but I'd rather have something that has a warranty on it. Also, Wall mounts aren't going to help me here. Of course, they would be a good start for a home-built unit (drill right into the wood), but anyhow.

I just can't believe that I am unable to locate a mount that is able to provide 23-24 inches of lift from the top of the desk to the center of the higher-up monitors.