Need help

I’m trying to build out a chest rig that will let me swap out magazine carriers and I’m not sure where to start. I’ve looked at Spiritus and I do like them. I want to be able to carry at least 6 PMAGs, I’d prefer 8, or swap for at least 3 SCAR magazines. I also have a GEN-12 that I’d love to carry magazines when I want. Any recommendations, thoughts, advice or am I just being stupid?