The Nimbus could be straightened and the others possibly rewelded. Might as well reinforce while at it if you take either route.
Only break I’ve seen on KH frames is the neck breaking off the crown. If u still have them take the pieces to a welder and have him put them back together. Newer KH frames are reinforced, 2011+ I think.
Kevin’s
Post 228
skrobro’s
Post 140