Assembled the previous wing stand that I cut down. Proceeded to hang the right wing, levelled tip and root and lifted up the center portion until the fishing line lined up with the spar predrilled holes. I already knew that putting the lift point 1/3 down from root give better results. This is because the root is significant beefier than the tip.
I clecoed on the top skin and market a line on the inside of the skin for fitting the wing walk doubler.