Something you could consider is making the track flattish with some natural bumps and rises but not a heap of big jumps.
Then lay out the turf on that, nice and flat, glue the seams with something strong.
This way you could build a few jumps etc cover them in turf and then move them and the markings around at track change times.
You could have something permanent like a long tabletop that you could use the whole thing or come off the side.
Maybe a cross over bridge like at a few of the EOS races
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