Hi there,
I have been looking for the back bonnet for this very same machine. If anyone contacts you with parts for this machine and has a spare bonnet, please let me know. If worse comes to worse, I could cast the mint door cover for you from mine, but you would be ahead if you can find an original. As to the broken part on the bonnet, this is common. The best solution would be to have that part welded and then machine out the hole for the lock.
Please keep in touch!
Rick Hector
rickhector10@hotmail.com