Jim,
I rode several CX500s extensively in 1980-81 when I worked at the Mother Ship in CA. It had the most "squishy" suspension of all the Honda street bikes so I can fully appreciate the need for a fork brace. I can't recall all details but it seems that it had smaller diameter fork tubes than the CB750?
Anyhow, I loved the large fuel tank and flat, broad seat on long trips. Nice work on the restoration and redo into a cafe racer!
Tosh