David, interesting to hear what you say about final drives, I presume the higher (?) ratio (9:41 compared with 10:41) was to counter the increased weight of the final bodywork ?
General question - high/low ratio terminology ? - 9/41 = 4.56, 10:41 = 4.1 - so which is high/low ratio ?
So, for every 4.56 turns of the prop shaft the rear wheels will do one full turn if I understand correctly.
Having said that, I think the early chassis cars are not that heavy - 650kgs vs 880 kgs for an early saloon and 950kgs for a 2nd series saloon. The later chassis are 670kgs. I will get mine weighed once it is finished for interest's sake
The chassis' gear ratios may be different as well , but I have read differing views on this
Re colours, not sure yet, but probably 2 tone. I am still researching original colour(s)
Another point, picked up by Ade, is that the bodywork is Pininfarina. I had some correspondence with a known authority who said:
"this car is a early Lancia Aprilia cabriolet, an officially catalogued model. It was built by Pininfarina but this company was subcontractor to Lancia for certain models, hence the lack of any PF badges"
In some ways, who made the bodywork is not too important, I agree with Josef, this bodywork retains the "aesthetically pleasing aspects of the standard Aprilia". What you cannot see from the photos to date is the lovely upward flare of the front wings compared to the much flatter profile of the saloon.
Planning to start taking the cabrio to pieces soon ........