so, to be really paranoid:
1. setup a hdd password
2. use drivecrypt or other full disk encryption system to encrypt the disk.
3. create a container with 2 layers with truecrypt
4. in the inner container put a password protected rar file (3.x), in the outer container some pr0n.
5. encrypt the rar file with some unknown encryption system, one you made yourself for example.
finally put the laptop in a safe where the inner side is composed of some material which will ignite at >50 degrees celsius.
If you don't give m the key / password to the safe they will have to use a torch or drill to open it. This will cause enough heat to ignite the safe itself and the laptop with it.
It'll be a hassle to work with the data every day, but if it's for storage then it should be fine
Get a big magnet and set it up with a remote and keep the remote next to you at all times. If needed, turn the magnet on. That can get a little expensive though.