While you can change your floor plan in the future, remember you can't change the location. With this in mind, don't make the mistake of falling in love with a floor plan and forgetting about the property and surroundings of your home. If you fall in love with the layout of a master bedroom in floor plan, but don't like how it looks out over the street in the model home – chances are your home in your location will have a totally different aesthetic, view and therefore feel different. Remember when choosing a floor plan; ensure the interiors will fit with your location.
The other thing to consider is the quality of the space. The rooms created would be just under 3m x 3m (approx 9ft x 9ft) which would be very tight for a double bedroom. So this means this space could be used for a small bedroom or perhaps bathroom or dressing room depending on how the internal layout turns out.