I wanted an STL of a vintage car with a fair amount of details, but that is relatively easy to print. I couldn't find anything suitable online, so I took a crack at designing one myself. This is what I came up with. The finished model was heavily influenced by a few images and designs online.

The model is modular in design, so that various components can be printed in different colors and then glued on, or snapped into place.

The only required supports are for the rear end of the main body, and underneath a part of the seat.

Printing suggestions:

The tyres pressure fit onto the rims, the clearance is extremely tight, so if you have problems with elephants foot or your printer is not dialed in, you may want to scale up the tyre STL on the X and Y axis and test print it. I found that sliding them on from the axle side made this easier.

Tiny details - many of the parts have tiny details, I found it best to slow down these prints a lot to get clean prints. You can add a modifier box in Super Slicer and Prusaslicer (Im sure there is a Cura equivalent) to slow down just the required layers, or slow the entire print via your TFT when required.

Steering wheel - you can cut a small piece of filament off and drop it in the hole before inserting the steering wheel, this allows you to adjust how far it sticks out.

Color changes - I used the color change option in Super slicer to print the instrument panel in different colors and get the "dial gauges" to have a display. The dial hands are raised, so you could use a marker to color them in as well.

Happy printing!