Wow scary, I'm gonna have to give you a "TL;DR" on that one.
Actually, it would have been helpful if I did read a little more carefully - crz6662 did say (way back there several novels ago) that he was using ClockworkMod recovery.
I ran the same experiments as you - put a space in the nandroid backup folder name and attempted a restore, with both Amon_RA and ClockworkMod.
Just as you said, ClockworkMod produces a (spurious) "MD5 mismatch!" error message, and Amon_RA produces the "run nandroid-mobile.sh" message - on screen
So, it looks as if crz6662 actually has 5 good Nandroid backups - he just needs to name the backup folders without using any spaces or other unusual characters. Hopefully he didn't go and delete them because (I) convinced him they were bad!
Please don't send me PMs - post your questions so others may benefit from any answers given.