Summary

After I fixed the Lamborghini Elemento by him, I continued looking at creations done by @ThatOneGuyWhoDoesThings , and I found a GTA Spano. However, like the original Elemento, the tire was in the middle of the the car, the meshes were too thin to print, and stuff like that. So I fixed it even more. Currently, it still is not 100% watertight, but at least it doesn't seem to have visible cavities on the body and windshield when I sliced it.

I also was able to remove the tire from the middle and it can be printed 4 times separately. Use wire or metal bars to attach them to the car depending on how big you printed the car.

And BTW, if you want it at a 1/70 scale, scale it at 1450% on Cura. (Note: The full length of a real Spano is 183 inches, or 464.8 cm).