The problem at model sizes is to prevent the scuppers sticking and trapping water on deck. When miniaturised, the weight is insufficient to keep them free swinging and it doesn't take much to clog up any hinging arrangements.
An alternative can be to fix the scuppers in place and then provide a drain from the lowest part of the deck just inside the bulwarks which exits at or below the waterline. This can block up too but a bit of wire will easily clear it.
Colin
