I have no experience with them, but Northern Stainless is on Brock Rd. S in Pickering. I believe they have some marine products and custom examples on their website.
We can second Klacko Marine https://klacko.ca
If its metal and on a boat....they have always been the best source for anything we were looking for and if they can't do it to their standards, point us to who can. Just a helpful bunch that are fixtures in the marine industry.