TOGOAT in TinkerCAD

Easiest: the whole car in one file
assembled_no_nose.stl (17.6 MB, no nose, so you can add your own)
assembled_reference.stl (18.2 MB, with the nose)
Same one-file car, zipped (if the .stl won't download): togoat_car.zip
Every part separately, if you want to color them: togoat_parts.zip (6.3 MB, unzip first; README inside)

How

  1. Use a computer, not a phone. Download one file above.
  2. Open TinkerCAD and start a new design (or open yours).
  3. Click Import (top right), choose the file, keep units at millimeters and scale at 100%, then Import.
  4. Wait. A big file takes a minute to show up.
  5. The car comes in at real size: about 306 mm long with the nose, 271 mm without. Now add your force arrows next to it.

The separate parts each have two tiny 1 mm cubes at the corners. They line the parts up with each other, so import them all and they should land in place. Ignore the cubes.