After the front and rear gear brackets are aligned and tack welded to the fuselage, set up the 2 axle jigs with the 2 axles and a length of 1.25" tubing. Be sure to draw a line on the floor and use plumb bobs to carefully align the axles. Use electrical tape to mark the location of the gear legs on the axles and the location of the axles on the cross tube. Drop a plumb bob from the center of the cross tube to the center line on the floor.