No need to go to steel to add the rad hose. You can even use a rubber MJ plumbing coupling to make a flexable joint. Steel will hurt as much or even more when you hit it. It's heavier and it's prone to rust. IMO plastic is the best option for an intake snorkle. As for the vent lines, it should work for all but the carb vents. They should not run to the snorkle because of possible problems with the vaccum created in the snorkle.