Poly Coasters

I want a poly version of each coaster shown, an example of what I want them to look like would be the image in the bottom right. I just want the cart, not the wheels attaching them to the coaster, and only 1 cart of each image, not the whole multiple of the carts (Example would be on bottom left, I just want the 1 not the whole 7). Another request is I want the seats, the railing, and color of cart, to be 3 separate materials that I can edit. If you want to recreate the bottom right example cart as well that would be great but not necessary.