Melting metal is a blast and you can do virtually anything you want to!!!
Warn has templates for mounting points that you can get from their website I think so that will help you in that aspect, but keep in mind that you will need to be DAMN SURE of your worksmanship as far as the welds go after you bolt it on and use it. I would suggest several trial runs to verifiy the ability of the setup to handle the stress of winching from it. A catastrophic failure could mean lots of damage to anything in the vicinity if it were to go.
My Gen II rear is coming along nicely and I should be done with it in another week or two. (For those who did the Deer Valley trail, you will noticed the heavy design influence I had from Mike Ross' rear bumper
)