Luxury yacht venture behind $7.8 million plans to expand Gladesville marina
Developers Neil and Scott Sutton, fortune comes from Sutton car dealer empire
Residents, recreational users oppose plans, which affect Parramatta River use
Ferry company says river would become unsafe and commuters affected A scar on the face of our waterway , Canada Bay mayor Angelo Tsirekas
Concern extra boats undermine plans to make the river swimmable by 2025