Here are the measurements on a standard Sylvan hull (without a false bottom):
Waterline to top edge - 1.875 in or 4.8 cm
Waterline to top of handrail - 2.25 in or 5.7 cm
Dock* to waterline - 2.0 in or 5.1 cm
* That's what my own dock measures, but it may not be truly prototypical; I've seen other model docks that are half that height.
Q: Do you really have to cement your Huletts into permanent positions? I thought they were designed so you can change their position as often as you want to. At least that's the way I would do it if I were building them. If the model wouldn't stay in the desired position, I would drill a tiny hole in a non-visible location and insert a 'set' screw to hold the two overlapping pieces in place.