I started off by fabbing my own roof rack, you can see pics of it in my sig. Depending on how complex of a design you want to make it can be pretty easy or pretty difficult. I made mine about 4" up front and 6" in the rear via a 45* upper center-section so that the spare tire that was on the roof could be held more securely or i could carry more cargo, also there were four light mounts on the front and 2 on the rear.
As for a bumper, you'd probably be just as well off getting a 4x4 shop to build you a bumper, especially since it is near impossible to design one to go with the contours of a WJ. Also if you are "so-so" on welding you would not want to rely on your tow points when the time came.
[size=4][b][color=blue]98 ZJ - Clayton 4-link - 35's - 8.8 - HP30 - LOCKED[/color][/b][/size]
[url=http://www.mallcrawlin.com/forum/showthread.php?t=4421]Buildup and wheeling pics [/url]