lover the build , impressive model
i would like to recommend you fit 2 pumps , especially in the pump out side of things , after all, how do you bail it out ?? if the pumps don't work ??
these pumps can be very reliable , but ,they are very basic , and free flooding too , which means water sits in them all yr round .
you could also fit some form of manual drain cocks ,as back up .
a idea i want to try is , fit a false bottom in a big model ,on the water line ,or 25 mm below it , then cut the bottom out of the hull ,to allow it to free flood , water proof well , but this idea does away w the needs for pumps ,as the water drains well from the hull ,as you lift it from the water , looks like it will work , in theory any way ??
this has being done by other UK modellers
good luck , love the model