i was thinkin about this today,
i think it WILL look sweet, but you need to be very carefull welding it like that as not to warp the roof.
what i would do is start on say the front driver side, cut about 3" TACK WELD (w/ mig of course
) then move to the pass. side rear do the same. then on to the pass. side front, then the driver side rear.
keep following this pattern till all is removed and you have plenty of good strong tacks in place,
the follow the same pattern w/ about 2" stitch welds till you have a solid seam.
my .02
hell i may try it some day too