So, am needing to stitch together 4 Central Valley 150' through girder bridges with a Micro Engineering girder on each end of the run. The delicate details of these Truss bridges seems to preclude a permanent stiffener underneath. Any ideas on tieing these together so the track ends up flat? The total run will be about 53 inches of bridge with the two 4.5 inch girders applied to either end. I took one kit out last nite and started cleaning up the parts and eyeballing the assembly and am puzzling it out, but could sure use an idea or two, or three, or.....?