Hi there,
Many of Ernst's possessions were auctioned at Hermann Historica last fall, one year ago now. Among the prized items were his PlM (at a dead give-away price of DM 3,600 - before bidding started), his EK's and a few of his aircraft's instrument panels.
Where they reside now, I do not know. Perhaps you could try contacting Hermann Historica. Their website is something like
www.hermann-historica.com and if that doesn't work, try finding them through
www.altavista.com or
www.yahoo.com. Good luck.
Kind regards,
Reinout