Soon as you like. Make sure you leave spaces for Roads, try to use less than 256 colours: Spaceports are 50 pixals by 50 pixals. Each house is 1 pixal by 1 pixal and can support 10 workers. Each job is 1 pixal by 1 pixal and will harvest 1 resource. Garrisons are up to 20 pixals(total) can be any shape. Laser batteries, shield generators, power generators, fire stations, police stations, farms, and all that jazz, have bigger effects the bigger they are, but require more workers(1 per pixal). Everything on the planet works as one big city, so if you have 10,000 houses in one development then you can deploy 100,000 people overal. Fortifications and natural landmarks are seperate. Any Questions I am usually around.