This an early but failed model of the original Nightfall Speedway. Differences include 2D images of the color hills from the Doodads of NewerSMBW, A loop in the middle of the course intended to be just like DS Rainbow Road and Kirio Raceway, 3D Modeled Pipes, and MKWii Houses (Which I should've removed, model might be reported in a day). It also featured more in track decorations to give it a Mario Kart feel. This model is completed, but is not compatible with MKWii and the Custom Track featuring the new model will be released very soon.
YoshiMaster96: Jump Block Model from SM3DL
Torran: Moon texture from GCN Mushroom City
Skawo: Colored Hills Doodad texture.
Any model from the 3D Warehouse are owned by their original uploaders.