It's gorgeous! You sister is sooooooo lucky!
Not to scare you...but if you can get help on the zipper, do it! It took me hours to get the one on Jim's sweater right. I was doing it on the machine...I probably should've hand sewn it in from the beginning. I had to rip it out so many times it's a miracle I didn't ruin the sweater. Maybe you can put up a seperate post in the how to forum and get some tips from experienced "zipper putter inners"
I know I'd like some tips for my next attempt