A sturdy, flat table is essential to get a straight and true fuselage or wing. The table is the most elemental jig, as the fuselage is literally laid out on it and constructed on it. I built mine in 2 sections and strapped them securely together so as to make them one. Equipped with levelling feet it was easy to true it out. I then placed sandbags on the feet to further stabilize the table.
I put a very straight board at one end to act as a square starting point for all construction. I deemed that 0 station would begin 3" back from that edge, so all measurements started at that board +3. I made the surface of my table with replaceable pieces of MDF, which is very smooth and makes an excellant surface for layout. With a sharp drafting lead and accurate measing instruments I laid out the centerlines of all the tubes (following the measurements in the plans notes compensating for the fuselage bend.)
Blocks to locate the tubes where placed back from the centerlines the appropriate amount and secured with screws into the table. 2 identical sides are made in this fashion, then the table is set up to build the fuselage box. An accurate centerline is drawn, and blocks positioned to recieve the sides, this time held vertically in the fuselage jig. Note the baby welding tanks in the picture at right. I got full size ones pretty quickly.