Mark and Jim, I appreciate your feedback on the stem size. My original plan was for a thinner stem but I got nervous near the end. I could just see the cup breaking off with a catch and I did not have time to start over.
Scott, the finish I used was an equal parts mixture of clear shellac, BLO and DNA. I guess it is a friction polish. It heats up and hardens when it is applied. I have always heard this mixture referred to as "Shine Juice".
Mark, the base has a slight bevel. It may be slightly wider than the cup at the very bottom but not by much.
I have only been turning for a year. I get nervous with objects that hang out over the lathe bed this far. I have had catches that ripped objects out of the chuck. Also, parting close to the chuck is something that I do not have enough experience doing. This project went well for me, because once I hollowed and shaped the cup, I then put a live cup center in the tailstock which pressed a tennis ball into the cup. This gave me support on both ends while I did the rings and the stem. After I parted the goblet at the base, I flipped the goblet around and put the tennis ball between my 50mm chuck jaws and the cup. I brought the tailstock up to finish the bottom of the cup.
Thanks for the comments and questions.
Joe