Haven't had a chance to get the picture, but it all came from ebay, of which I managed to order 10m of hose. 6mm sounds about right.
Make sure to seal up all the pipe of your snorkle - test it buy putting a poly bag over thhe snorkle, it should stall the engine if it is all properly sealed. Rember also that in the bottom of the air box there is a water drain, and in y case this wouldn't seal shut.
Maybe go around the inside of seat box with seam sealer paint and silicone up where the wires come through the gland.
Check thhe wires into the throttle pedal while your at it. Make sure they have a good seal.
RT