AMCO, that is a great word - a "Tribute" car. Pays homage to the original without being a true replica or an exact copy.

In terms of over engineered roll cages, if the car was not actually built in period, even if built out of a mix of period parts, then it has to have a cage built to the current regs, not period regs. The same cage rules apply to a true replica, whether the original had a cage or not. (That debate is ongoing...)

Events such as Leadfoot score well because they do bring out the huge variety, and as they they are not scrutineered to or strangled by current MSNZ rules anyway, the event is probably all the richer for it - though there is an element of measured risk involved, one that most drivers and spectators obviously seem more than happy with.