Anti Thief devices.... what works

I have the following;
I mounted the starter relay down by the #8 header pipe, Limited access and usually very hot.
Battery in the trunk, with shut-off also in the trunk,clamps secured by wing nuts.
Coil on the apron, 30" wire.
Secret switches.
Adjustable rev-limiter.
Manual trans,lol.
Twin 3" full-length pipes.
I rarely ever lock the doors, but when I do,the vent windows are open. It's a 1968 hardtop so anyone can break in.
Parking at a Motel takes an extra minute but it's always been there in the morning. They'd have to load it up, and figure it all out later.So I like to park in a difficult to access area.