Congratulations on scoring a wonderful Conion!! The facsia for the door should be an easy hack! Let me know if you need any help, I fully made up mine from scratch, which was a lot more painful than what you need to do.
This is The Legend of the Mission Conion Deck Doors.
Many moons ago an urban legend began. So many Conion's missing their doors, but why?? Was it a manufacturing defect? Was it for more street cred? Did aliens abduct them all?? The answer soon became apparent...
When I was first on a quest for the answer one of the stories I read the most was of the deck doors being taken off by the owners; intentionally!! Whyfore I mused? The reason being that when a C-100 was being used in breakdance street battles having the door removed allowed for easier access to the bottom tape so there was as little break in the music as possible when switching from tape to tape or deck to deck. This seemed highly plausible! Afterall, we all love to think our radios were used in breakin' battles in past and this just gives them more street cred. After reading more collaborative stories, I settled on this as the truth behind the myth.
Alas, a year or so later, more evidcence came to pass. Less exciting evidence. Evidence that disproved the above theory entirely. It would seem that Conion in their R&D had not fully allowed for one critical issue in their design of the bottom deck, an issue that would prove to be the C-100's undoing! The problem was that when the blaster was running on batteries and the bottom deck was in use and the batteries died the entire mechanism would lock up and not reset to a neutral position. Hence locking the door in place for ETERNITY. The only solution was to take out a trusty screwdriver and prise the door off to get the tape out. And, in the process I would assume, breaking the door and negating the possibility of it being reattached.
Our poor Conions are rarely found intact for this reason. A mere oversight by Coney Onkyo allowing for many traumatic incidences of door-loss over the decades.
This is, to my knowledge, the real explanation behind the mystery of the missing C-100 deck doors.
Rock On.