Neat. Cheetah looks like a much more advanced design based on the PROM listing.
Also, from Wikipedia's Corvus talk page:
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Um, no, the SCALDstation wasn't OEM'ed from anybody. Valid designed their own Multibus CPU cards, memory cards, and graphics cards. I know this because I worked for Valid's founders in their hardware group. Some things like peripheral control cards were purchased.
The Corvus machine was lower end and came out several years after the SCALDstation.