Space Tileset Difficulties

[GriffonSpade]

My AmplioHexBig GT tileset currently has the basic terrain and units, however it lacks several things to be a complete tileset: listening post (base), refueling station (base), star lanes (road), terrain improvements (?), cities (of various sizes), and city walls(planetary shields?).

I'm uncertain as to what to do as far as art design and resource type ideas. The only thing I can think of is that the cities and terrain improvements should appear as icons next to the planet, rather than covering the planet, which can obscure the planet type.

Any ideas?