Why not buy a rack?? that looks like a massive amount of work to take a bike somewhere...
but just as a tip... usually what I do when i travel with the Bike.. I put black electrical take around the seat post, right where it meets the seat stay... that way when i take the seat out and put it back on.. I know the exact height of my seat, and i dont screw up the fit.
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Where are my aluminum pedals? 
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