Sure, here are more:
The top one is the water jacket I'm questioning on the non-rusty chamber iron.
The bottom one is from the iron that has the rust, which I've decided not to use.
I know I'll have to do more cleaning, but the walls appear to be intact. The top has the minute "chip", it does get to normal size at the lower end.
It's not as bad as the broken ones on this Mazdatrix page:
http://www.mazdatrix.com/faq/sidehsgs.htm
And if you go to the Rotary Resurrection forum, the rebuild write up is being sold as a set of PDFs on CD for $25.