I won't list my build because that will mean nothing at that stage. I will give you the meat and potatoes version of my build though. The goal for Ryan McMahon is to sit tall and straight in order to take away the corners.

Agility: Agility is going to be key as a big goalie. In order to stretch aside and move, I will need to be agile. Get this is 85 pronto.
Size: Taking away the majority of the net is a strength that the best goalie in the world have mastered. This is another attribute that I should make 85 a priority.
Hand Speed: A little razzle dazzle for the fans is never a bad thing and I think by having a quick glove hand, you will be able to achieve that. Think around 85 is accurate
Reaction Time: This is a base attribute that having at 80 will work quite solidly.
Rebound control: One of the key stats as if it is low, you'll give up on shots that come your way.