Joel Johnson's Team Trinity Optima Mid prototype from the 1987 world champs:
Mid protoype seen at the 1987 US NATS:
Katsunori Kondo's Mid protoype at the 1987 world champs:
Another one of Kat's prototype, on the starting grid at the 1987 world champs:
Joel Johnson working on his prototype at the US NATS 1987:
Hope this helps.
Tom