I am restoring an old railway station and have to re-build a door and frame. The door is okay as we found one, however the frame was destroyed. It is an exterior door but the opening goes onto a covered platform so it is not directly hit by the elements. I was goung to make the frame out of spruce or pine, any down side to this type of wood? It will be painted and more for show than for function. We are in Canada where the weather varies but overall a dry climate.