Wondering how other people have done this. My layout contains a fairly long section of elevated track. To carry it I basically bodged a 'system' using thin ply for the trackbed, topped with cork tile, battened underneath by a strip of 1" x 1/4" timber, the whole thing built in strips and glued/nailed together. Then the trackbed held aloft by pairs of timber struts. I've found that this 'works' insofar as I have managed to create a fairly sound trackbed with gentle gradients and plenty of flexibility. What have other people done?