I'll grind out the area of the cracks and weld them but the more I look, the more bends and twists I see in both frames. Either they both have had extremely hard lives, or these wee frames are more easily damaged than you would imagine.
It will take a little more looking at, a bit more work and a bit of head scratching before I decide just which one of the frames is going back into the bike.
I also sat with a mug of tea looking at the swing arm until I had convinced myself to move the bolt and make it right. So that's another job added to the list.