Welcome to Cruise-chat Jenner. I cannot answer how obstructed your cabin may be, but I will say that in December 2004 I booked a couple on the NCL Majesty and to save on $$ they chose to take the obstructed view. They stated that as long as they received a little sunlight in their cabin they would be fine. When I booked the cabin for them I called NCL and asked just how obstructed the cabin was, they had different % of obstruction. The one they were in was 15% obstructed. Well, when they arrived on the ship, the only thing obstructed was the very top of the window the bottom of the lifeboat was what they saw, they had a clear view out the window.
I would suggest that you contact your travel agent, or call NCL directly and ask them what the percentage of the blockage is, you might be pleasently surprised.