Snorkel for my Land Rover Series III

I want to know if someone has a guide on how to make a snorkeling for my Land Rover Series III I plan to do it with PCV

It's very easy, just look for the box. If it has the air deflector flap, you're all set. If not, make it and put elbows that go straight to the side or to the back to drill through the hood and take it out. But the best way is to drill through the fender and take it out from the side, advance to the windshield and lift it up along its edge. Nothing complicated.