Sci-Fi Catan Miniature Set

I'm seeking a 4-piece miniature set for 3D printing, themed around a sci-fi futuristic or alien aesthetic for the game Catan. The set should include: - Settlement and City - Roads/Paths - Boats The design should be simple and clean, not highly detailed or overly complex. I do not want to have to use supports when printing. Familiarity with the game to understand what is needed. Dimensions are small with the biggest piece being about 25mm wide and 25-30mm tall. I also require royalty free ownership of project after completion and payment. Ideal skills and experience: - Proficiency in 3D modeling software - Experience in creating miniatures for 3D printing - Strong understanding of sci-fi design elements - Ability to deliver clean and printable designs