Craig
As torture goes, it wasn't bad. Since I was on the chassis dyno, the moment the smoke came out a tailpipe I got the cut it off sign (unlike on the track, where I've sometimes thought I could get back to the pits, and made things worse). While the piston was in many pieces plus the crown, and the valves in that hole were smushed, the cylinder did not break apart. It cracked, but didn't break (I had to beat it apart with a hand sledge to get it out of the spigot, though). So the wrist pin on the end of the rod didn't start sawing on the case at all. I can identify a couple of dings inside the case, but nothing to have to deal with.
Your bushings for the throughbolts held up just fine.
I am left contemplating whether I'll find anyone who will purchase five fine J&E pistons, knowing what happened to the sixth. I suppose they'd be fine for a street motor if you wanted valve pockets for 52mm 993 RSR intakes, and 12 to 1 CR from a 66mm crank. Given the history of this (now superseded, I believe and hope) design, doubtless there are several batches of five out there for the same reason as I acquired mine.