I haven’t added limitations because there are soo many of them (first of all, if you choose Ladder Chassis, you can only make it in steel).
If someone want to add anything (es. in the other colums of the spreadshet), just do it, and share it here 
Yes, i know, drive type and engine placement is not so accurate, i don’t know if there is an unlock date for everything or it depends on the body type (es. i haven’t find any mid engine body until 1965); today i had no time for investigate further, maybe in the next days i’ll made it more accurate.
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