Three stage whole house water filtration system installation

The Plan. The main water supply line coming from the well and out of the pressure tank is on the right. A 90 degree elbow behind the duct leads to the spin down sand separator. The red and black line is where I made the cut to attach the couplings for the ingress/egress lines running to/from the filter housing. My neighbor advised positioning the spin down trap before the pressure tank. I'll save that for another day.