Sorry to read what has been happening to your Pagoda.
Tom, I second your thoughts ...... We have a lot of these goings on in the UK.
I would take out the windscreen, sit in the car with a double barrel shot gun facing the front ..... ask your friends to cover the car with the car cover again.
And then .......
As Cees wrote, You can install a small video camera behind the grill.
As Rick wrote, Get a $20 motion sensing floodlight fixture and place near the 280. Screw an electrical outlet adapter into the socket that the bulb goes into. Plug an extension cord into that outlet and run the cord inside to a light.
We look forward to seeing his/her face in utter shock on utube ( Caught on camera ) in the future! If he/she dare to come back!
I am reminded of the film GRAN TORINO. Clint Eastwood.
Keep us updated of any developments.
All the best
Kemal
280SL
Manual LHD69