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I recently finished building a helix but had a much larger radius to work with. Clearances will be tight to maintain a reasonable grade unless you are working in N scale. I set the bottom grade and then just worked my way up using 3" lengths of 1" X 4"s for spacers. As mentioned by many others you must lay your track as you go and would advise you use a standards guage to check your work. I also ran all my locos up and down the helix each time a segment was completed to confirm that the track was in good working order. (My ace in the hole here is an Athearn TrainMaster that is particularly good at finding any flaws in trackwork). Obviously, your subroadbed has to be wide enough to accept the spacers and you can make the spacers any height you need as long as you have clearance from one layer to the next. Good Luck.
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