ORIGINAL: djnelsen
As I said before, the stock forks do very little to support the hingepin mounts since they're unsupported at their open ends... and if you look at how the chassis's broke, that's exactly what happened... the hingpin mounts tore out towards the open ends of the forks.
And yes, I agree that this mod may cause breaks to happen elsewhere, but I'd rather have something else break rather than the chassis.
Hmmm, that's odd. But that being the case I'd have tried making some kind of hingpin support to attach at the front of the gearcase.
As my concern now is that you've changed the stress point further back in the chassis and might cause the whole gearcase to sheer off with a lesser impact.
But who knows, and that's the fun of being a true hobbyist and trying to design a fix/better mousetrap.
Good luck.