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(for "track" hubs)
The slight issue your going to have is the rear spacing, a nature boy is 130mm, a crosscheck is 132.5 . I have a nature boy and a crosscheck which I've run with 135 and 130 hubs, both fixed and freewheel no problem, but it might be a hassle getting the hub spaced correctly. (just something to consider)
If it 120 rear spacing you need, perhaps a small mash works would be about right.
Crosscheck, nature boy