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The production frame has additional bosses higher up, this is a pre production model I found on a google 650b group.
I don't think NFE is an alternative, the crust thing only fits 42mm 650b with fenders and is really a randonneur while the NFE fits way bigger tires and is quite different.The elephant is almost the same price at 1385$ vs 1350$ for the crust.
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Pelago Stavanger. 41mm trail on most sizes. Sold as a complete bike with 700c but seems to fit 47mm 650b.
Crust Lightning Bolt prototype: