I added the lines to the Draft with the North Bar now.
Works like a charme, I would say it is even better then the original Naish one, as it is lighter and also durable.
The first knot in the LWR Line is 5-6 m away from the little ring it goes through at the kite, then it has a knot every 2-3 m and down at the bar it alo has no knots for about 4-5 m.
This is, so that the anlge of pull is as little as possible, to reduce wear.
I pulled the LWR line through the floater and then checked the exact length while flying the kite, tieing it to the line underneath the floater on that exact position with a sling tied to a knot-end off the steering line/rope/tails end.
As every kite (12/14/17) requires a bit of a difffent length of line due to its different width, I left some rope (1+m) inside the floater, I plan on making 3 slings, each sling exactly adjusted to one kite - fast and easy adjust --> take the floater off, choose the sling, fix it to the knot, job done)
So my conclusion: For little money (indeed you only need the rope, the elastic rope and the 2 rings --> less then 30 Euros) you can make 3 LWR systems, that work really well with any bar.
If you have a Naish kite that supports LWR attachements out of the box its effortless, if you need to get the attachements sewn to the kite in a workshop it is a bit more effort/cost.
To be honest I started relaunching my high aspect ratio kites only with the LWR now, great on snow, great in the water (waves...you are relaunching the kite so quickly from any position..) makes my life so much easier...
great for beginners too!