I have taken the liberty of building a database, where everybody can post the make, model and other statistics of their "Stradiviarii of keyboards." I have personally been building a database just from signatures and web searches of existing Mellotrons, but I think it would be interesting to see where they are and to try to get as complete a database of all the extant instruments possible, just to see how many are left, and where the heck they are! Have fun....