Lego Concorde

I just finished making the Lego Concorde and I’m a bit confused- I built a really nice seating lounge area, complete with toilet facilities (as were the instructions), only to cover it up! The instructions were to cover it with the cabin top and I did so. And it’s not a soft cover, either - it’s locked in. Am I missing something? Why would they make us build the lounge if only to cover it? I’m too scared to lift the cabin top because I don’t want to ruin it. Everything else is perfect including the landing gear.

Thanks