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Some guys over here rallied one for a while. They're not a bad car, decent bang for your buck and reasonably lively with the lack of weight. Don't recall them re-inforcing the points at all. Probably seam welded and the rollcage would have been bought as close to the pickup points as possible and that's about it.
Ideally as with any strengthening you want to tie the point into a more rigid part of the chassis, or spread the load over a greater area. I'd start by laminating the pickup points where possible and plating around the ones you can't. Same in principle as with any composite material car, just try and get the load spread over as much as the chassis as you can.
Just remember that every piece of metal you add is more weight that you not only have to accelerate but stop as well. You can build a sherman tank out of an excel if you went silly and you'd never break the thing, but you're going to struggle for performance. If it's for simple club level racing, I wouldn't worry about strengthening. Plenty of careless people out there on the road clipping curbs and you don't (often) see them stranded on the side of the road with a corner ripped out of the thing.
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