Gary Sweat, I may be wrong with what I was referring to as a sub-frame

if this is what you are calling a sub-frame, I was thinking more of the frame that connects and braces the loader to the front bumper, and runs along side of the tractor connecting back to the upright part of the loader, I always referred to the pix your showing as the mounting bracket/frame, Perhaps what you are showing plus what I am talking about both parts included make up the sub-frame,

as I said I might be wrong,
BTW that is some great looking welding and fabricating you've done,