Great! Do you have a reason for doing the light first though? It might not be difficult to derive a Regular from a Light as this is a mono-weight typeface, but it can get pretty difficult with other types. I start with Regular, then the lightest weight and the darkest and I will interpolate the weights in between.
Actually there isn't a particular reason, I thought it would be easier doing the light first...moreover it's my first type, so i have to improve my techniques (: