skylights & roof traps

I need to replace a skylight (the type on the top floor of the stair in a townhouse) on my roof. I also need to replace our roof trapdoor with a nice, new locking one. The roof trap door will be in my son’s new room (creating 3 bedrooms up there) so I want it to be clean and safe. ANy recomendations for good, non-leaking skylights and roof trap doors? (which open easily?