The lug needs to be either in a machine screw threaded hole, (ya sure) or use a nut and bolt to fasten the lug, sheet metal screws are not acceptable. Size the bond to the largest conductor or overcurrent device depending on tables 250.66 or 250.122 and if you increased the wires for voltage drop you must adjust the bonding conductor. Bonding bushings on the conduits might look nice but will serve no practical purpose on PVC. Alan--
