and the ADRs came down from the mountain and didst veryily say, "thou shalt not weld a cast or forged suspension component"
if you have pressed control arms (like a corolla) then i believe there would be a chance you could legaglly cut n shut them. your welds would need to be really good, or you'd need to pay someone who can weld better, and ideally you'd box across the bottom it for extra strength
of course, this would need to be engineered, so call around a few engineers and find out, then let us know too :D
custom bushes are fine, fook has them