macerating

Hello, I have made use of the professional advice goldmine on this forum many times in the past, but always by reading existing threads. With my latest plumbing project I figured it's time to post a thread of my own! I am firmly in the DIY class, and I would love advice from others out there...

I'm adding a bathroom in a recently-enclosed garage. Instead of busting up the concrete and trenching to the septic tank, I'm feeding this into a macerating toilet, which I'll then tie into a nearby line that goes to the septic. My question is about venting. I've roughed in a configuration, but...