I would not put a 70 mph WARBIRD as a 2nd or 3rd plane. MAYBE a 4th plane, but a much higher probability of a 5th plane.

A second plane is normally a low wing aerobatic trainer. It flys a little fast than the high wing trainer. The 3rd plane normally is flying faster than the 2nd plane is is an actual aerobatic plane, not a trainer. Now throw in things like tip stalling, a faster flying speed again, having to fly the plane in to land it and landing the plane (to many people) hot.

A 4th plane, MAYBE. A 5th plane there should be no problem.

Just my $0.02 worth.