Take off the skinny silver washers and it'll fit better. Just check your clearance of the 6 speed block as you don't want to ruin your frame.
The thin steel washers are important tabbed washers to help with the cone adjustment (or were).
That's true but he wants more axel, the skinny washers serve to stop the cone and the lock nut from rotating together. Mostly things are there for a reason, but in your case you have a couple of options.
Locktite on the locknut is your temporary friend here and ditch the washers.
Or ( proper version ) you can space the axel to 120mm properly as below (Note: mine is a 5 speed pursuit wheel).
Yours is all wrong at the moment and to get the thing to be as it should you need two new locking nuts and drop the thick silver spacer on the non drive side and one on the drive side.
You will need to re-jiggle the cones to make things correct and depending on the dish of your wheel you may only be able to use a 5 speed. I'm no wheel builder so you need to consult someone who knows what they are talking about.
(Note the English thread.