I placed the bottom skin on each table and placed foil under the areas that will see eposy as R33 and R57 are attached to the center spar. I used the laser level to make sure that the 17.4" line stayed level and the same level with the 17.4" wl drawn on the fuselage and the center spar. I then floxed the R33 and R57 and attached a 2" 2 layer BID tape in the corner and peel ply'd. I rechecked with the laser level to make sure it was correct after the layup.