The idea behind this adapter was two-fold: Space the sprocket out by 7mm and reinforce the sprocket studs with some POM-rings to stiffen up the whole lot. The major dimensions, in case you want to copy it:
Things are starting to take shape...
Came out nicely and should explain the drawing.
The XS500 wheel and as you can see, the studs have been milled down on two sides, as to align the sprocket.
Four more POM-spacers to stiffen things up.
Et voilá: The finished product. There's six hours between the first and the last picture...