Basically combined a barn model with a double track to make this. Added a couple supports to fuse them together and was done.

I have printed a couple with supports to the roof edges, and I also used custom supports just inside the barn to help with the ceiling support inside.

Barn: https://3dmag.org/en/market/item/9228/

Note: My first print in brown failed and the roof shifted. You'll see that in the photo but it works anyway so we kept in in the game as a "hurricane damaged barn." :-)