Well, on Journey On (a 2005 model) the water tank is in under the V-berth, so anything is possible.
A few thoughts.
First, the front water tank has a capacity of ~23 gal. Not sure what the aft tank holds, but make sure you're not decreasing your supply. Fresh water is a precious commodity on a cruise.
Second, the tank was put in place and the V-berth liner put over. So, you'd have to cut a hole in the V-berth floor to install a tank. Though not impossible, you should think about it. You'd also have to re-route the water line to the pump. Journey On has the water pump in the hot water cabinet. Which, by the way a good place, since it stays dry, though hard to remove.
Third, I don't know if an original front water tank is available. You'd have to contact the factory, Triton Marine, to find out. Otherwise, look at available water tanks.
Boris