The Supersonic was built to rate as a Quarter tonner though it was not overly successful. Should be listed on this site but I could not find it, my old boat is though.
www.histoiredeshalfs.com/Quarter%20Tonner/Sommaire%20quarter.htmThere is a flush deck version down in Batemans Bay that was owned by a local shipwright. He was up here for a couple of days holed up because of the weather. He was selling the boat but raved about it.
On my quarter tonner I added reef points to the main like in the photos only my main was dacron. SS rings are available everywhere. The main in the photo is off a Holland 25, another well known quarter tonner.