The last one that I fabbed for a CJ (TJs may need more effort) started out life as a large piece of C channel (7 or 8 inch, I believe) measure your winch carefully). Fabrication involved; cutting to length, drilling a few holes and wielding a piece of 1/4 plate one on the forward flange to extend the flange upward for fairlead mounting. Not particularly difficult but it needed the extension flange to give the fairlead good support.
Mounting to the frame was done with some large angle bolted through existing holes (make certain that there is a piece of pipe around the bolts in the frame if you bolt all the way through it to keep the frame from collapsing when the bolts are tightened. Bolts with the nut inside the frame do not need a pipe.
The winch plate from harbor freight is so cheap that it makes the fabrication of one a waste of effort, IMO.
...a well prepped, well driven, vehicle should do well in any terrain, including the highway.
Carburetors became obsolete during the last century... do what ever it takes to get fuel injection...It makes bigger grins off road.