i am in process too, no pics yet as it's not together.
i am using 4x4 3/8 wall tube for the reciever portion, tucked back in tight to the fuel tank.
above that is 2x3 3/16 wall tubing that goeas across the backside with 2 reciever tubes in it for mounting a removable winch plate or luggage rack etc. eventually it will have side rails to protect the qquarter panels. i'll post some picks later if you want.