My guess is you not doing something right. You should get something, unless it's got a completely open wire inside.
Have you triple checked each individual lever, to see if they are all in the right place? Sometimes you can bump one, when you get off, knock it slightly out of place, and the machine will not start. Also try moving them and putting them back to the starting position.
There is a 40 amp fuse that appears to feed the ignition, check for a blown fuse.
Jump the seat switch with a wire, and see if that makes a difference.
Then, you can jump the other two safety switches on the levers.
Before you have it towed, you could pull the starter, and have it tested locally. Provided you have a re-builder nearby.