hi I think this mod is grate, I was wondering if you would make it available for 1.12.2, If not that's ok I still think it is a cool mod, and I think it was really cool that you made it for your kids :)

This was made into a DataPack by Hellogaming you can read about this project here and download it here.

Woow

That is great, congrats.

If you would like to surprise your kids fast. Check this tutorial How to create a car, that is for MCreator (it is free). Once you get interested and learn coding, it could have anything you (or your kids) want. Model must be created or converted to Modded Entity. Make it a passive creature, ridable, disable spawn, and don't forget the spawn egg. You will need Forge for this to work in game.

Also, just in case, watch importing to MCreator. If you have not done it already, place each wheel in a separate group. You will be able to animate them separately, they will constantly spin (if you prefer that). Explore the setting when importing the model. And the lights could be emissive (needs Optifine).

I am not an expert at modding, maybe someone else can give you better tips.

Hope you and your kids have lots of fun.

cool