Light cleaning, maybe some acrylic rods to support things right and make sure it's environment is humidity controlled. I don't think it needs to be restored at all. Freeze it in time as is.
Conservation>restoration imoI think we might be surprised how good it looks with just a cleaning. But I think they should fix any sagging structural issues, and glue down any loose decals. I wouldn't say no to replacing the missing chunks of the name and registry either.