With all the snow I decided to practice making my V shapes gutter. I'm gonna use flat lock seem joint and not lapped. The pictures attached show how I tried working the cant into the copper. It was recommended that I not do that since I can add the cant afterwards as a strip of copper. Just got a new slate book called (drumroll...) The Slate Book by Brian Stearns, Alan Stearns and John Meyer. It's a great book and you can buy it here. The book has a great recommendation where they use a wood cant attached to the copper with copper straps. Great idea, and I wont have to buy more copper!