Summary

Note: Slice the .stl file directly using Cura. If you try to "fix it" or "clean it" using other software, it might give unwanted result. Just check the printing simulation to make sure all is fine.

A simple "side skirt" to make the front body align with the rear deck if you lowered the rear deck. I use double sided tape to attach it to the front body. Or you can use glue gun (it's pretty easy to remove glue gun later).