I think the standard bazooka comes with a 1/2" threaded connector. Those plans have a 3/8" nipple. You would need a 1/2 to 3/8 threaded reducer and you could just screw them together.
This should be a pretty easy project as long as you have the parts. The threaded nipple goes through the cooler and you have washers/nuts on each side. Tighten them down. The valve just screws on (put some teflon tape on the threads to prevent leaks). The inside connections for the bazooka don't need to be water tight, so you can just hand turn that.