If you're planning on taking it rallying, more welds rather than less are what you need. You may end up seam welding some of the panels for added structural strength... because that car is going to take a chassis-rattling beating if you drive it at speed over 3,000 miles.
Focus on non-essentials when lightening. I wouldn't touch anything structural until you have a chassis-stiffening cage in the car, already.
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