Hello! Just finished my first color work cardigan with Steeking

I have 2 questions:

1. I am slightly disappointed with the length (I want it shorter like how I am holding it in the picture but didn’t realize until I tried it on) would it be crazy to cut it and then redo the bottom? (It was a bottom up so I’d have to cut into it to change it)

2. The pattern did not include instructions on finishing I used a sewing machine to sew the steeks before cutting but I have noticed other people sew in ribbon or lining as reinforcement do I need to do that or will it hold?