I've done it, not hard. Easy to get good penetration. Hardest part I had was keeping the line smooth. Small changes in cut off blade or torch placement made a significant difference in the finished smoothness of the mod (ya don't want a wavy seam there)
Like everyone said before, cut a section, weld it till it won't move, then cut the next section. Then come back and weld it up slowly with even heat across the roof.
Go slow, take your time. The roof behaves better than I would have thought regarding heat.
If you've got a cage, gusset it to the a and b pillar and then stich weld it to the roofline.
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