User blog comment:Commuter/LEGO checkpoints/@comment-114.72.144.105-20200821000452/@comment-43594177-20201020222241

I think I can make the rest by dismantling these existing ones. (But I can't seem to make Checkpoint 4, or Checkpoint 10, and I don't have the pink Checkpoint 6 base, or the grey Endless Mode base, though I have the bricks.)