I made my own wine glass rack years ago. Drove the lumber guy crazy at Lowes. Had no measurements, just held my arms out and said, "I need six pieces of wood this long." For the chain, I counted links. It's a beautiful and very functional glass rack. You would never know a tape measure was missing from the assembly process.
However, it doesn't work for the Reidel O stemless glasses.

However, it doesn't work for the Reidel O stemless glasses.
Here's what I use. Works especially well on the wider Montrachet series.
Works upside down, too. ;-)