Dork disk??? If you need it, it's there. Otherwise, unless it hurts your feelings...........don't worry. The sun will still come up tomorrow.

Frame looks great, people that don't like sloping top tubes probably have legs long enough to ride the "right" sized bike. Not that it really matters.

If my feet are on the pedals, my butt on the saddle, my hands on the bars and.........it feels good. It's good. It doesn't matter how far away the pavement is.

Your Sirrus is a great looking bike and it seems that your son got the answer on your board.