original_query: What were the features of the Pininfarina-designed concept cars based on the BMC 1800 and 1100 models?
query: What were the features of the Pininfarina-designed concept cars based on the BMC 1800 and 1100 models?
answer: The provided text only states that Pininfarina designed two concept cars based on the BMC 1800 and 1100 models in 1967 and 1968, and that these aerodynamic models were rejected by BMC.  No further details on their features are given.