I'm going to work on the forward wing spar first. I need a long, flat surface for this one, as well as the aileron and flap spars, so I took a shot at making a flat surface on my table top, which is no longer flat. I placed those long jig boards on top with shims underneath where necessary. I used that 5 ft. long angle aluminum as a straight edge and moved it around the surface to check the flatness along the length.
I used clamps and screws to smooth out bulges from the shims. It's really a trial and error sort of thing. Shim the low spots, clamp around them to flatten out, rinse, repeat. I only used the screws on the back side after I was sure where they were needed. It's flat now!
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