I don't know if I have posted this in the right place but here's the idea;
Have a base model of the A4's made with no modifications and then make and script the modifications so they can be turned on and off, off = not there, on = there and changing the performance of the engine, then script the Nameplates & Numbering so people can select the A4 they're driving from one drop-down list (e.g. Mallard, Sir Nigel Gresley, etc.) and then a particular year to apply the correct livery & modifications from another drop-down list.
What do you think?
Have a base model of the A4's made with no modifications and then make and script the modifications so they can be turned on and off, off = not there, on = there and changing the performance of the engine, then script the Nameplates & Numbering so people can select the A4 they're driving from one drop-down list (e.g. Mallard, Sir Nigel Gresley, etc.) and then a particular year to apply the correct livery & modifications from another drop-down list.
What do you think?