Adding the fitting to the bottom of the tank...no problem, bending the vent line...another story. I managed to get it to match on the first try (with a little hand tweaking), but thinking about how to bend this in 3D was tricky. For me I made the sharp bend first, then had to think about what bend angle would give me the right results. I'm thinking it may have worked out better if I started with the shallow bend first. In the end it worked out fine. I still needed to do a little tweaking to get it to fit right in the plane. Overall I was pleased with the outcome (more luck, than skill).
