I've seen them made using 2 Harbor freight engine stands as a starting point.
I haven’t done an earlier Manta, but it would be similar to supporting a GT. Simply fabricate stronger bracketry. The guys in Europe do this all the time.Bob, could you elaborate on your rigging for picking the front of an early Manta/1900? I'm hesitant to use the protruding bumper brackets. They are puny.