Nice idea - but unfortunately in the real world some tea leafing gypo will see that numberplate cam and rob it!
I got my new boot switch yesterday - which I didnt realise was metal!
I have taken all the insides off my boot (without breaking a single clip

) and had a good look at how much space I have to play with (heaps!).
I've ordered a flush fit camera - so once that arrives I'll drill into my boot switch and mount the camera.
I've measured that it needs to open about 40mm and that it needs about 3 pounds of force to open it - so I need to get a solenoid powerful enough to do this. I can't see any 40mm solenoids, but can get a 15-20mm one and hinge it so that it opens.
I'll keep you updated with my progress and take piccys as I go along!