Check out the build up. I think it'll give you a idea of what exactly need to be done. I pretty much am doing what you want to do with yours and I would say it is by far WAY easier that doing a cab swap or a engine swap. (
http://board.marlincrawler.com/index.php?topic=20515.0 )I just finished it. Hopefully it'll give you inspriation. OH and I live in southeastern Washington. I'll try to figure out what shipping would be if you want me to make you a crossmember. here's a picture of what it'd look like.
and installed.