Install skin by going to Steam>Library>Right Click My Summer Car>Properties>Local Files>Browse Local Files>Copy car.png To The Images Folder.
OPTIONAL: Install plate by using Texture Pack Importer http://www.racedepartment.com/downloads/texture-pack-importer-tool.17294/
Was watching some old episodes of Archer and in the one, where they were in Monaco (S02E11), there was a Type 49 Lotus with a Herbie livery (Lana was driving it later in the episode). Naturally, I had to make it :)
I added some details that weren't in the episode, like the blue-red color scheme...