First I would like to say that I do know that a 13b is 1308cc, but 1300 is much simpler and easier to remember, not to mention 1308cc was already taken... I also know that a 12a is smaller, and my dream the 20b is bigger.

 

How the rotary was born (5 pages)

How the 1st gen was born (4 pages)

How the 2nd gen (FC) was born (4 pages)