Sounds like you want something like the Guy in AL used to build. It was carier like many have built, but then covered with the stock chrome bumper. It looked slick, I sure someone still has a pic of it. Last I heard the guy had some MAJor health problems and wasn't building them anymore, but they wouldn't be hard to replicate.
One other reason your not going to see somthing like what was on that Toyota on a K5 is the the same reason you won't see one on an FJ-40. They are both Land Cruisers, but the newer models have bumpers that are intragated into the body lines. The K5 and FJ-40 (& the Scout, CJ, Patrol, ect.) have bumpers that kind of float out past the body. The newer TLCs, ZJ, WJ, X-terra, ect NEED an aftermarket bumper to fill in the area that was covered in plastic with the stock bumper.