IIRC, aciender has some pics in his gallery of the in bumper mount. Its not complicated but requires some good thick metal and some welding. A hitch reciever would be about the same amount of work, you would just have the reciever cut through the bumper rather than the winch fairlead roller.

Also, winch size is a limiting factor when installing the winch in the bumper.

Good luck, this is also on my list of mods. I already have the a friend welder ready to help and the metal plate, just need the winch.